No, you did not refute my claim. You ignored the entire bug, focusing just on Lennart's final conclusion. That's cherry picking.
Seeing as that the bug report, the LKML and systemd mailing lists came up with a full solution of the bug, you are a liar if you say that the systemd devs don't fix bugs.
Here's the full solution: using the generic 'debug' parameter of the kernel command line to turn on systemd debugging is the correct way to use that parameter, as stated by Linus himself. What is incorrect is generating too much logging for the kernel message buffer; this problem is fixed by fixing the original assert bug in systemd, and by Lennart's design decision to defer as much logging as possible until userspace is up.
It's all there in the bug and related discussion. You refuted nothing. You are a liar. And an Internet blowhard, a keyboard warrior.