I'll be interested to see if anyone else can reproduce this.

Indeed. This is a really bold claim and so far we have one person who has reproduced it on a single machine.

I'm no Apple apologist by any means but I'm a little skeptical of the claims in the twitter thread. It's easy enough to imagine that the poster made some kind of mistake in his methodology or some other variables are at play that he didn't consider. I'd withhold judgment until there's some corroboration.