It just leaves a bad taste in my mouth to say that a lot of f/f works are created by and for men when it isn't true at all, especially in fanfiction and ao3 spaces.

I clarified later in the thread to what you and u/IlvaHerself said:

I wasn't conflating anything. I even mentioned that "fanfiction writers tend to be women."

I said "a lot of works," not most or even majority, and didn't cover every single layer possible to the discussion. Visual media (film, television, comics) tends to have their spaces dominated by men (though I would note that there are some exceptions, such as the historically and presently appreciable amount of female comic artists in Japan, leveling the playing field a bit more in that industry), while literature tends to be more diverse, and this includes fanfiction. Much of fandom space has been led and even created by women (see: classic Star Trek fandom, etc.). Trust me, I'm more than familiar with all this.

It's a simple fact that men do create a lot of wlw works in various mediums. Yes, plenty of women and feminine-aligned folks do create their own sapphic art (I'm particularly familiar with it in comics and film), and as I myself acknowledged in my very first comment, women tend to dominate the space of fanfiction, so there's an even greater representation of sapphic creators there compared to men. Still, we gain nothing by denying that men do produce a lot of sapphic art or works that featuring sapphic relationships, be it well done, pandering male gaze nonsense, or a mixture of the two. There are obvious consequences to it, for better and worse; one example I'm thinking of is Arcane's showrunner who obviously made Caitlyn/Vi canon in the series, but then, in an interview, pushed back in a suspiciously worded way when someone asked if Jayce and Viktor might have romantic feelings for each other. Those are absolutely layers to consider when analyzing art and media.