Also: just saying that something is a myth does not make it any less true. The whole point is that systemd (and Pulseaudio) is anti-Unix because its author does not understand Unix design, how would his opinion be of any value in this matter?
I find his arguments quite compelling and honestly, at this stage saying "the author does not understand Unix" just sounds silly.
Judging by his work and his writings, Lennart probably sleeps with a copy of "The Unix Programming Environment" or other such classic under his pillow. He probably knows Unix 10x better than you or me (feel free to point me to your resume/bio if my assumption is wrong :) ).
Just say that you don't agree with his design.
That's fine and it's acceptable. It also turns this debate into something kind of like Linux versus Minix. Working code (his) wins for now ;)