First, yes, he's correct in talking about the SOFTWARE side of that, so if your anger is with this dude, you better just outlaw software, because anyone can choose to NOT do these things. That's the entire point of open source. Make stupid decisions, and you have zero following.
Second, let me finish his thought for you:
But we will never enforce using any of these features in systemd itself. It will always be up to the distro to enable and configure the system to become an immutable monolith. And I certainly don't think distributions like Fedora or Debian will ever go in that direction.
We don't really have any control over what Microsoft decides to do with Secure Boot. If they decide at one point to make Secure Boot reject any Linux distribution and hardware vendors prevent enrolling user owned keys, we're in just as much trouble as everyone else running Linux will be.
He's very CLEARLY illustrating his intent to prevent the very thing you're shitting your pants about. You're literally inventing a scenario you've thought of yourself, and getting upset about it.
I bet you're super fun to be around.