Tencent owns 40% of Epic Games, which owns Fortnite and the Epic Games store. This might be a symbolic move more then anything, because unless they intend to be rigorous about Tencent’s connections with all these companies (e.g Can’t buy anything on Epic’s store, or make micro transactions in games from companies owned by Tencent), they really are not stopping anything.
Your purchases through Epic or Riot (League of Legends, Valorant) are not seen as ‘direct’ transactions with Tencent.
Basically it’s exactly the kind of grandstanding Trump would partake in.