A "debunking" might consist in arguing that Yudkowsky's doom scenarios are impossible - or it might just consist in arguing that they're much more improbable than he thinks they are.

Arguments exclusively about the PR value or political or moral correctness or political advisability of Yudkowsky's arguments do not count for the purposes of this market, even if they purport to be debunkings. For example, someone who does not value the continued existence of the human species is not "debunking" Yudkowsky by saying so, they are merely expressing different core values.

Generic assertions that AI risk is a non-issue, which are common, do not count, because:

The counter-argument to Yudkowsky does not have to be correct. It just has to be apparently serious, and in the form of a YouTube video.