Oh oh oh, now I think I understand what you are saying. Looking through that link, there are some new "best" races for warlock, such as Kobold and Warforged, if you are using floating ASIs.
So the question is, do all the optimizers switch from Tiefling warlock to Kobold warlock, or do they not care about race and pick other things like halflings?
You, obviously, think it will be the former (they'll all play kobolds and warforged) because of what you think the optimizer mindset is.
I, obviously, think some people will do that, but that we will see much greater diversity, because of what my own mindset is.
I haven't started any new campaigns since Tasha's, so I unfortunately don't have the evidence you are looking for. I'm a little startled that would accept as evidence somebody posting in a forum to say, "Yeah I'm an optimizer and made a halfling warlock", but maybe that will happen and I'll guess we'll see what your reaction is.
Until we see new D&DBeyond data we won't know for sure.