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UPDATE:

It took some time for me to figure out how to find the article from webarchive, since some links and the search function does not work there.

While still not quite satisfying, these do provide additional details.

Part 1: https://web.archive.org/web/20201112011803/http://archive.wizards.com/default.asp?x=dnd/rg/20070327a

Part 2: https://web.archive.org/web/20161031215249/http://archive.wizards.com/default.asp?x=dnd/rg/20070403a

Part 3: https://web.archive.org/web/20171108150341/http://archive.wizards.com/default.asp?x=dnd/rg/20070410a

So the conclusion is:

1. Unarmed Strike/Unarmed Attack is neither manufactured weapon nor natural weapon, so the rules like "can be used as a secondary attack" do not apply to them. The best you can do is to use it as an offhand attack.
2. For the weapon enhancement purpose (and for that purpose only), the Unarmed Strike/Unarmed Attack is always considered as a natural weapon, if you are not a monk.
3. On the other hand, a monk can take this as both a natural weapon and a manufactured weapon. Those articles keep using examples of taking unarmed strikes as off-hand attack in TWF but never explain if it can take as a secondary attack in the form of natural weapon if the character is a monk, leaving the question unanswered.

(It seems, though, that the unarmed strike cannot be used as a secondary attack, even for a monk, and is always considered as manufactured weapon in this case scenario. But the author never points this out in those articles.)

PS. I have seen people discussing this like this one:

Are Unarmed Strikes Natural Weapons?

But it doesn't seem to have an answer anywhere describing the situation when a monk (or even a non-monk) what an unarmed strike is and what it can do exactly that can satisfy everyone. Is there an errata for this?

Since unarmed strike DOES NOT considered armed and does provoke attacks of opportunity (if without the feat), DOES NOT threaten any space it can reach (if without the feat), and, most importantly, DOES receive additional attacks from a high base attack bonus, it is quite obvious that unarmed strike is not and never has been considered as a natural weapon (otherwise, you can simply use it as a secondary attack and take -5 penalty regardless what other stuffs you are using in your full attack) and hence is a manufactured weapon, even though it is not actually "manufactured".

But in the description of Magic Weapon and Magic Fang, it says

(The spell does not change an unarmed strike's damage from nonlethal damage to lethal damage.)

-- Magic Fang

You can't cast this spell on a natural weapon, such as an unarmed strike (instead, see magic fang). A monk's unarmed strike is considered a weapon, and thus it can be enhanced by this spell.

-- Magic Weapon

I looked around and, while there's no example in MM, it seems nothing prevents any creature to do more than one attack in a natural secondary attack if it can use it to do the same as the natural primary attack. The only reason the existing monsters can't do it is that they don't have a natural attack that can attack multiple times.

+13/+13 (Unarmed Strike, flurry of blows)

Since unarmed strike DOES NOT considered armed and does provoke attacks of opportunity (if without the feat), DOES NOT threaten any space it can reach (if without the feat), and, most importantly, DOES receive additional attacks from a high base attack bonus (regardless if with the feat or not), it is quite obvious that unarmed strike is not and never has been considered as a natural weapon (otherwise, you can simply use it as a secondary attack and take -5 penalty regardless what other stuffs you are using in your full attack) and hence is a manufactured weapon, even though it is not actually "manufactured".

But in the description of Magic Weapon, it says

You can't cast this spell on a natural weapon, such as an unarmed strike (instead, see magic fang). A monk's unarmed strike is considered a weapon, and thus it can be enhanced by this spell.

-- Magic Weapon

I looked around and, while there's no example in MM, it seems nothing prevents any creature to do more than one attack in a natural secondary attack if it can use it to do the same as the natural primary attack. The only reason the existing monsters can't do it is that they don't have a natural attack that can attack multiple times (as per the rule, they are not allowed to do so without using unarmed strike).

+13/+13 (Unarmed Strike, flurry of blows. I wonder if TWF penalty should be applied since nothing says whether it is main-hand or off-hand, but let's say it is main-hand for now.)