That's a rather big clue isn't it?
Im addressing those who rebuke him for speaking in local dialects instead of a one size fits all approach....for which theyd rebuke him for the way he spoke anyway.
I'm not buying that. For the very odd way he speaks, yes, but for not altering his speech for different audiences? Nope, no one would pick on that.
A better examply of a morphing shape shifting phoney is algore who became Reagan in one speech then became a AME preacher in another.