Let's not bring communism or race into this. The issue is that Tencent is a big corporation that is also arm of an *Authoritarian (possibly approaching totalitarian?)* government. Either of those issues would be bad enough alone (owned by big corporation = not indie & pure-profit motives will inevitably stifle creativity and fun; owned by an authoritarian government = possible censorship or forced content), and both together is obviously worse.
BUT, 30% ownership doesn't mean much(right?), especially when Swen owns >50%. That means that Larian still retains control of their products. Tencent could cause a lot of financial harm to Larian by suddenly selling all their shares, and may try to influence Larian's products through such threats, or they may try to buy more shares of Larian to get >50% which then would be bad. But as is, things seem...fine?