The World Championship showed us that Ding had found a way back closer to his previous level. I think that chess players should celebrate that possibility.
The final blunder seems obvious in retrospect but from what I have heard was not immediately obvious to the GM commentators.
It's sad that you make accusations without any more evidence than that.
I don't think there is any point in an investigation .
This was a crazy tournament but the last game is seriously suspicious.
I'll get to that in a moment, but consider this: in several of the games, and in fact in the tournament overall until the last game, Ding Liren was outplaying Gukesh. I would say that Gukesh only really beat Ding Liren in one game. The other decisive games were decided either by Ding Liren committing some blunder in time trouble, or by Ding Liren simply outplaying Gukesh.
But the last game is really what makes me think that there is a fly in the ointment. Ding Liren should have easily drawn the last game. Any 1500 rated player in that position knows that you don't trade rooks, and if you do, you make sure not to trade the bishops. Why Ding Liren OFFERED a rook trade while his bishop in the corner is inconceivable.
Unless someone paid off Ding Liren. And why not? It isn't as though he's raking in the cash like other World Champions. He isn't making anywhere near what Magnus Carlsen makes, not even as much as Kasparov made.
Now, for the record, I am not saying this is the case. But I would strongly suggest that FIDE investigate. Not that they will. But I will say that Gukesh is not as good as Ding Liren, and not as good as Magnus Carlsen.