My first question was for literary reasons - I don't expect TDT to be involved in any significant resolution unless it has been at least mentioned in the text previously, prefereably with some explanation.
I'm not convinced of the analogy to AI-FOOM. Harry's capabilities and pseudo superpowers are the result of intelligence and rationality applied to magic, not of recursive intelligence amplification giving far greater levels of intelligence. It has been explicitly said somewhere that AI will not be involved in the resolution, so I'm not particularly worried about that.
Additionally, since this Harry lacks Eliezer's interest and previous work on advanced decision theory (TDT was created because he needed a reflectively consistent decision theory), and I don't see any reason for Haryy to have developed TDT. I suppose it could be treated like the hedonic treadmill and feeding your inner pigeon work, but that seems unlikely.
Transhumanism and Reductionism don't seem to be in the same class as TDT to me, so even if your proposed schema about how Harry gains superpowers was right, I don't think TDT would be next, or really in the running. TDT seems much more like a technical achievement than a philosophical viewpoint to me.
It has been explicitly said somewhere that AI will not be involved in the resolution, so I'm not particularly worried about that.
Where?
Evidence: