You don’t have to worry excessively. Many people know a lot of strategies are NOT from him. If he were submitted, I’ll vote no, though the run itself is really cool.
About stealing inputs:
Well, it seems to have been stolen in the earlier part, but the inputs of the latter part are not released. So he did it by himself at least in the latter part and there might be a few things you learn from his run. As long as TAS is a speedrun, perfectly optimized TAS will result in the same inputs. Apart from this case, if you make efforts enough but result in the same inputs, is it called to be a plagiarism?
In the first place, the problem is originated from his first run, I think. If it was not optimal, why didn't you suggest his providing .m64 instead of submitting? It looked very rude to criticize while you suggested his submitting. That’s why I don’t basically point out missing TAS like
SoM on nicovideo, though I mentioned several TASes there without their permission.
I hope abeshi will communicate. It’s sad that his bad English may prevent him. I don’t mind being an interpreter though my English is also bad. According to his comments, he has to ready for the entrance examination so he won’t appear before next spring. Abeshi, if there is anything, please PM me.