Does a dwarven rogue with dwarf rogue substitution levels 1 and 3 gain +3d6 sneak attack on (standard) rogue level 5?

Question

This question is closely related and a follow-up to the question whether dwarf rogue substitution levels 1 and 3 incur a loss of sneak attack damage. The accepted answer was that dwarf rogue substitution levels 1 and 3 do not grant sneak attacks, thus a dwarf rogue with these substitution levels would get the demolitionist ability (extra damage against constructs) but no sneak attack.

But the entry in Table 3-15, PHB p. 49, for rogue 5 is: "sneak attack +3d6". If a dwarf rogue took the substitution levels 1 and 3 - would he get the full sneak attack at standard rogue level 5?

Answer 1

No

To substitute means to take something out and put something else in it's place. If at level 5 you'd gain +3d6 sneak attack, you don't substitute... you just add. Why would anybody ever take standard rogue levels 1 and 3?

I cannot cite any raw, since substitution levels from magazines aren't RAW anyway, but common sense says he'd get +1d6 if taking a level granting better sneak attack after his substitution levels.

PHB pg50

Sneak Attack: If a rogue can catch an opponent when he is unable to defend himself effectively from her attack, she can strike a vital spot for extra damage. Basically, the rogue’s attack deals extra damage any time her target would be denied a Dexterity bonus to AC (whether the target actually has a Dexterity bonus or not), or when the rogue flanks her target. This extra damage is 1d6 at 1st level, and it increases by 1d6 every two rogue levels thereafter. Should the rogue score a critical hit with a sneak attack, this extra damage is not multiplied.

Increases, doesn't become 3d6 at 5th level.