This is very true.
I understood feminism in Hollywood as a crock of bs because all of the "strong female characters" we kept getting were still conventionally pretty, thin, white women. Their looks didn't change much at all. The Hollywood machine just added extra qualities. No women of color, no women with disabilities that weren't pleasingly aesthetic, no seniors...
In Joss Whedon's case, there were a number of red flags that women of color tried to warn the fandom about, and at least one of those red flags was how he treated women of color in the Buffy series. I objected to the treatment of all of the black women slayers we saw in the franchise, (one was unceremoniously killed off, the other was a voiceless primitive dressed in rags, and another was a cliched street tough single mom), but he got on my shtlist when the only Asian slayer we got, in the last season, was left completely voiceless.
And then there's that scene in Firefly where we got the mage of a Black villain, threatening one of the key female characters with rape!
But that's a digression.
My point was Hollywood didn't adopt feminism at all. It just pretended to by folding the idea into their usual conduct towards women characters.