TL;DR is that there was a leak and now we know there is a gay sex scene with Henry(who is now canonicaly either a homosexual or bi when he was 100% straight in the first game) and a muslim negro that has 0% of him actually being there at this point in time, at this location. The former is a slap to the face, the latter is just straight up fan fiction, both are checking DEI boxes and go against everything the first game stood for. The developers, when caught lying and hiding these things, went into overdrive and now Vavra(one of the game devs) is melting down on twitter, has been for weeks, calling everyone a nazi. KCD ballwashers and Czech gamers(who wanted this game to be their Witcher so badly) are also in complete damage control mode, telling you that you're not a real fan if you don't buy the game over a sex scene or that you're a racist nazi if you have a problem with the negro that shouldn't be there. Several content creators, like Mack from WorthABuy are currently sinking their reputation wiping Vavra's ass and ruining their credibility as well.
In other words, KCD2 is just as bad as Veilguard, but it's even worse because Dragon Age was always a fantasy RPG, it can do whatever it wants. KCD2 failed to be a historically accurate medieval RPG like the first game and it wanted to trick the fans of the first game with the new direction, which will likely lead to the game failing now. As for why it was a big deal, well, the chuds wanted a culture war victory over Dragon Age and Avowed, having their "based" RPG BTFO the other two. You can tell how this backfired.