Oddbean new post about login | logout I found interesting the part about modifying the initrd image. I've done that in the past to save data from a broken system. Just somehow never occured to me, that you can do malicious things like altering the system after the user decrypts the data.
Check out who writes this article, they are Microsoft guys. Read this article, inside it there is a link to yours. https://unixdigest.com/articles/the-real-motivation-behind-systemd.html
I don't think they are wrong about this attack vector tho... (Btw. I'm not advocating for or against systemd. Users will decide what's best for them. E.g. for my line of work things like systemd-growfs/makefs are very valuable. It doesn't mean I have to have them on my laptop.)