This is old arguments, actually, like, 2008 old.
But it's been done, it's been parsed, and it's been worded in a way that cannot be more adequately put.
Your disbelief isn't anything new.
There's more, buried under the long history of RDM melee arguments that people ignored throughout the years. There's hard data that's proved it both in parse and in the math. Just because people want to cup their ears, close their eyes and go 'na na na it's not real because it breaks with my preconceptions!' does not change the reality of what actually happened. I sat there and witnessed this guy myself. (probably still have pics buried in my Photobucket, actually.) It was the real deal.
Ask a RDM to try to replicate that now at 90? Doubt it.