I can't judge the advice, I can only relate my own experiece.
All I'm saying is that I read the thread carefully, dressed very male, no makup no nothing, yet was addressed by a female TSA agent and everything went well.
Except my long hair which were tied and my boobs that I tried to conceal, I don't think there was anything obvious - except maybe that I had opted out of the xray machine because of what I've read.
Anyway, it all went well so I'll keep opting out of the xray machine, just present in my gender and won't care about what gender my passport has.
I'm now in Sao Paulo, about to go to Argentina and nobody caused me any problem.