I'd say that 1998 when Rivers started stalking and harassing women who were just having their own lesbian-only and female-only events - was way before GC movement started (also, why transgender-only events are held and praised, but lesbian-only events are promoted by woke media as "bigoted"? Why one group trumps another?). First GC in modern sense started massively appearing somewhere around time when Stonewall started dropping LGB and became big when Stonewall completely dropped LGB - so years around 2012-2015. Gender identity is very new concept, from around 2005-ish or so, so there could not be anyone critical of this concept before it appearance. On Tumblr there were modern-type GC circles before that, but those were limited and in their own bubbles.

If you mean gender stereotypes critical - second wave, etc - then it was about absolutely different thing, it was against gender stereotypes, it was about "men and women can do and look any way they like, men and women are equal, society should not enforce rigid stereotypes, and gender nonconformity should be the new norm". It is still often believed by modern GC people, as many of them are gnc themselves and are feminists, but not all. And even "Transsexual Empire" was mostly criticizing gender stereotypes and that transsexualism is called a diseas and that "following strict gender stereotypes and medicalization" was the cure to that disease. Book is pretty agressively written, thought, but it is common for old-school feminism, plus author is a lesbian, who suffered from "translesbians", so she is even more mad than normal. However, even with all that, that book is mostly criticizing gender stereotypes, most of it not about transsexualism at all, and "the disease of gender" and not the gender identity or anything like that. And, well, it is basically the only book on a topic from those times.