Neither he nor Charisma have unequivocally stated what happened, so ut is heresy.
Sorry to burst your bubble but everything I posted about Carpenter came straight from her mouth. She gave an interview at a convention over a decade ago where she described just how appallingly he treated her and how hurt she was by it, how he made her cry over and over. How he deceived her when he pursued her to return to the show for the 100th episodes. She also described how uncomfortable it was to work with him on the dvd commentaries and how he led her to believe he might involve her in Dr Horrible but never contacted her again.
And throughout her very honest retelling of her last year working for him, she constantly praised his 'genius' because she was clearly aware that she was probably destroying her own career by being honest. Years later, she started redoing the Buffy convention circuit, her career reduced to bit parts and tv movies by then, and she has stated that she has decided to move on from what happened at the end of Angel and re-embrace it as a good part of her life. (Because it was and will likely remain, the pinnacle of her career.)
Whedon has never denied it and I believe her, not because I believe the woman in all cases. But because season 4 of Angel made no sense whatsoever and Cordelia's disappearance and demise was one of the worst, least thought out storylines to ever come from Whedon. It was just awful. He'd spent years building Cordelia into a brilliant character and then made her do weird stuff and be gone. It made no sense until she made what happened public.
I loved Buffy, even the Spike redemption arc that so many people hate. I loved Angel until it went off the rails in season 4. I loved Firefly. I'm in the minority that enjoyed Dollhouse (which had more than 2 male Dolls btw) the overall storyline had great potential as a harder sci-fi. Most of all, I absolutely loved his initial run on Amazing X-men. That first issue with Kitty walking through her memories as she returns to the school was a thing of genuine beauty. I would just love to see how his X-men movie would have turned out if he hadn't been replaced by Brian Singer (a bad, bad movie maker and a probable a rapist). Though both of his Avengers movies were massive disappointments but I gave him a pass as he made no secret how constrained he was by Perlmutter, Feige and co.
I'll probably still go see Batgirl and maybe Justice League but I'm not going to stick my head in the sand. Whedon's a talented writer who writes fun and engaging dialogue and some wonderful characters though he constantly relied on deus ex machinas to resolve the corners he wrote his plots into. He's also a dick who abused his power over the women who worked for him and removed his wife's agency and gaslighted her for most of their marriage. He is not a feminist by any shape or form and he doesn't deserve, nor did he ever deserve praise for his feminism. He also didn't invent the female superhero, he was just the first to manage to make one so mainstream.