That sounds a bit far fetched as Tencent is hardly a rpg company. And if they want to get into the market I would expect them to focus on a Runterra/League of Legends rpg (they are already working on an mmo).
Tencent is an everything company.
As long as they think they can make money out of it, there's nothing in the gaming scene they wouldn't invest on.
Incidentally they already had significant investments in Larian (well, significant from Larian's viewpoint, minuscule from their perspective), which is why according to this story Larian is acting as an intermediary with them.