Oh fuck off.
When TRAs say they are on the "right side of history" they may be correct because history is subjective, told by the powerful, and women are routinely written out of it. We have whole systems, such as name change at marriage, still working against us, quite apart from centuries of bias, oppression and generally not-being-seen-as-fully-human.
This guy is appropriating a term - herstory - and thus devaluing it so that it no longer means anything of use to women. Women, the actual people written out of history - unlike this guy.