I think chestfeeding (ugh, ugh, ugh, I hope my phone never learns that word) is one of those stupid things that has snowballed out of all proportion and become this totemic signal of "inclusion" on very slight evidence indeed.
I read once that a survey had been done on this, and of the tiny number of trans or non-binary mothers (who may or may not identify as mothers) who responded, something like two of them used that term, another three preferred breastfeeding, and maybe one liked the term nursing. So it's not even the case that all, or even most, of these people want to use that hideous word.
Though maybe now they'll start clinging to it because it's hit the news.
(Wish I could remember where I saw those figures. Not going to Google it as I don't want that word sneaking into my phone's dictionary...)