It's the lie that did it for me.
Maybe it's not a lie, just missing info: "Chinese" in the front.
First I thought it's bullshit too, but then I thought again. We often forget that China is huge in terms of sheer manpower. So let's see:
There are 1 billion Chinese.
Let's assume there are 100 million gamers - 10% of the population.
From those let's assume 5% dedicated fans of Winnie the Pooh. Which is an extremely low estimate, if you look how leadership cults work and considering life-long indoctrination starting in early childhood. That's 5 million gamers in the Winnie-Fanclub probably well organised in what they have for Twitter. And's just the dedicated fans of the leadership, not counting their wider circle of people who just tag along trying to make a good impression.
So when GOG announced releasing this game which they hate for making fun of their glorious leader - there's millions and millions of angry people - indeed gamers - standing in line to give GOG hell. I can imagine people in GOG HQ going very pale when they realised that... that's dimensions and lightyears more shitstorm power than the few hundred? even thousand? ResetEra "activists" equally getting riled up over nothing. And in the name of the glory of their leader - so they'll even be encouraged, and not blocked by the Great Firewall.
It's a messy situation GOG maneuvered themselves in, and handled in a really bad way. They could have brought forth some legal shenanigans, blame crashes whatever. Saying "because gamers" - even if true - makes all Western customers go wtf, but also tells those Chinese internet soldiers "Yay, we did it! Long live Winnie!".
They could even have stated "We just learned that the game makes fun of the Chinese president and his mother, and in Poland we take mothers very seriously, so we don't want to sell this game", and here people would probably shrugged it off as another weird GOG decision.
Of course, if they are afraid of a Chinese shirstorm DDOS attack, they should have done their research about the game and never listed it in the first place.