Sam Bent already has a bad track record and here he’s framing positive changes (like adopting SELinux and Wayland) as negatives. He also highlights that the NSA originally developed SELinux (he claims they’re still developing it but I’m not aware of that and he provides no source), which reads to me like he’s implying that SELinux is untrustworthy or inferior to AppArmor, which just doesn’t make any sense.
I can’t speak to the other points but considering this alone, I’d disregard anything he has to say. There’s only so much time we have and I’d hate to waste it on someone who’s been known to spread misinformation and bad advice. If there are any serious issues, I’d assume someone more competent and trustworthy would bring light to it some time soon.