OK, I'm going to go ahead and declare this to have been determined fake. Matt has been "on vacation" since he posted it, but the comments are moderated and anything critical or questioning the validity is not getting thru while plenty of praise is. And at least one piece of evidence, the js clock updating each frame while the source code for the website only has a 32 ms refresh interval, seems irrefutable.
I don't know what personal circumstances he might be going thru to make "fake a world record, jack up Patreon subscription cost for folks trying to find more about it, and disappear for a while" make sense to him, but this is rather disappointing and souring.