Regarding Armorer artificer's Armor Model feature as describe in Tasha's Cauldron of Everything:
Your metallurgical pursuits have led to you making armor a conduit for your magic. As an action, you can turn a suit of armor you are wearing into Arcane Armor, provided you have smith's tools in hand.
Item: A suit of armor or a shield. A creature gains a +1 bonus to Armor Class while wearing (armor) or wielding (shield) the infused item. The bonus increases to +2 when you reach 10th level in this class.
Can an Armorer use Enhanced Defense on the armor, since this is Arcane Armor?
I want to make sure since the feature does not say that a suit of armor that becomes Arcane Armor also turns into a magical suit of armor.
So I can assume it is not a magical suit of armor and can be infused, since the wording does not give the attribute "magical item" to an Arcane armor.
If indeed an arcane armor has magical effects, but without it being magical per se, then that leads to the extension of my question:
Because an armor "also expands to cover your entire body, although you can retract or deploy the helmet as a bonus action."
that means that it composes from different parts or it becomes a single piece suit, with pieces interconnected with each other? On which of those two cases can I add multiple infusions?