Bonuses from Maker

No, he didn't say the same thing.
I thought that was quite clear.

You said:
"The chance of you getting +5 out of [-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5] is the same as that of [0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5] "

He essentially said:
"[-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5] becomes [0, 1, 2, 3, 4, 5]"

Frankly, the latter makes far more sense.

That's what can be inferred, not exactly what was implied. Otherwise, I wouldn't have bothered to ask. I know he had the wrong idea though. More often than not, stimulated weapons do come out average.