Death of the author only goes so far. Ideally, yes we would all be able to separate the work from its author. But it’s not always going to be possible.
What if the artist is still tethered to their work inherently? What if some of the writer’s harmful actions or views bleed into their work? It’s hard to enjoy Harry Potter with how JK Rowling is so involved in the series still. It’s hard to enjoy any Kevin Spacey roll knowing how much of a monster he is in real life.
A lot of Doug’s problematic views, be it his anti evolution bent, his homophobia, or his transphobia, do bleed into his work. It is hard to not associate Doug with an objectively transphobic character he created when he is transphobic himself. This is the guy who not only has been openly transphobic, but said and I quote that "transphobe and homophobe are made up words used to slander conservatives and people of faith with a mental condition".
There is a reason that Earthworm Jim and Interplay have ran far from Doug.