I don't love the guy or anything. But you're pulling pieces together from different contexts over almost 10 years to tell your story.
The quote was about a presentation in 2013, not the project as it is now. Guido's complaint is mostly that they were equating "compiled" with "performance" and were not rigorous in backing that up. The presenters may have been young. But I'd have made the same complaint. The blog thing was just snarky.
That was a period of time when he has admitted he wasn't doing so well as a human being and this is pretty low on the snark-meter compared to other BDFLs.
The project page as it is today says very little about performance 'wins' as I read today. In fact, it points out losses, in the same vein as the RedHat issue with Python linked to libpython posted the other day here. Their point doesn't seem to be "make your code go faster", but as an easier mechanism of distribution for some cases.
I'm not getting the "his" shot. I haven't seem him take credit for the work, just that headlines do because journalists are lazy. I may have missed something.
But the MS team's activities today are things he would have dismissed years ago. He's learned and changed his mind. If he was completely consistent with himself from 2013, I'd think he wasn't that bright. (I'll never understand those kinds of arguments about politicians)
You're drawing a line from criticism of a 2013 paper, through his current career, to a malicious intent or conspiracy. That's a lot more defamatory than a valid (but a little rude) critique. You're attacking a person's character, not their work output.