I think the difference between people's reactions to CDPR's transphobia and JKR's is that JKR is out and proud in her assertion that trans women are not women. That's cut and dry. But CDPR's issues might come across to many as a company being insufficiently woke rather than hateful.
The tweet is stupid and hacky, but it's a meme amongst plenty of internet people who aren't transphobes; they just like poking fun at those they believe are oversensitive. That's not to say CDPR doesn't have a massively toxic fanbase (it clearly does), just that those of us with internet friends outside Era have probably heard that crusty joke from unfunny people who nonetheless consider trans women women.
The Chromanticore thing might come across less as transphobic, and more as clumsy titillation from a place that's ignorant of the way trans people relate to fetishization of their bodies. To cis folk, the trans model could be switched out for a cis woman, and critics might call the image and character misogynistic. Whether or not they're right, most people don't consider sexualization to be the same thing as hatred. A cyberpunk movie might feature an android brothel, and one of the characters might be a sentient female android sexbot. And while the story condemns the treatment of this character, and fans would condemn slavery of sentient artificial life in the fiction, they might still enjoy the sleazy aesthetic of the character; and the ability to relate to them as part of their sexuality because the universe is fictional.
The fact that the Chromanticore model is transgender changes the context of the fetishization, in the sense that it's more egregious, but it's still very easy to lump complaints about them in with "prudes hate sex".
Finally, the issue with the character creator might come off as one of ignorance rather than transphobia. If you're an un-woke cisgender male, you might very well think that you're being inclusive by allowing male-presenting characters to have vaginas, and female-presenting characters to have penises; not give a thought to the voices, and pat yourself on the back.
Of course, anyone remotely familiar with trans issues will see a series of very trans-unfriendly incidents coming out of CDPR, and for CDPR to then try to claim they're being inclusive and that they're advocates for the trans community is going to make actual trans folk and trans allies blood boil, because ffs, CDPR. They desperately need some trans consultants on their payroll.
But the degree of transphobia on display here might appear less than that of JKR, because it's not cut and dry bigotry. I think that goes a long way to explaining why there's been less focus on CDPR's transphobia, why many people on Era are less disgusted with CDPR than JKR and don't feel they have to boycott the game, and why there's been very little discussion of these issues, because anyone who might have expressed any of the opinions above would be risking a ban.
I could be totally off base, but that's what I think is going on, and I hope it's somewhat useful in facilitating discussion of this topic.