Yes! He also mentions that NetBSD and OpenBSD have "kernel interface itself is highly stable anyways" but doesn't elaborate on how that's different from Linux's

Yes! He also mentions that NetBSD and OpenBSD have "kernel interface itself is highly stable anyways" but doesn't elaborate on how that's different from Linux's interface stability. The argument doesn't hang together. He can't claim that changes to userland tools aren't possible whilst at the same time claiming it's because the existing interfaces never change.