The question I am asking here is whether a "traditional" Large Languge Model resembling the GPTs will defeat the World Champion of Chess of that time (eg Magnus Carlsen), before 2035.

I define a traditional LLM as a neural net model primarily trained using unsupervised text completion (like GPT or BERT) and then optionally fine tuned afterwards as chatGPT and Bing were.

To qualify, the training corpus cannot be deliberately synthetically generated from the output of superhuman computer models not themselves meeting these criteria (eg AlphaZero or Stockfish)

Also, to qualify, this LLM must be a pure text generation model. It is not permitted to do any brute forcing of move trees (as AlphaZero does). The moves must simply be the completions given by the text AI when presented with the board state and history.

If the world champion declines to play the LLM, then the question will devolve down to the highest rated player who plays such a match, provided they are ranked in the Top 10 worldwide. If none are willing to play, this question will resolve to the best estimate I can get from prediction markets as to who would win if they did play.