"If you cannot update yet, at least disable password logins: set PasswordAuthentication no in your sshd configuration and restart sshd. Either one closes the hole." (only AI would characterize a critical SSH implementation vulnerability as a hole closing game)
An attacker who can reach your SSH port can log in without knowing any password. It takes one connection, works every time, and needs no retries. (It sounds like the writer is bragging about the exploit instead of describing it. AI does this)
The attacker needs the name of an account whose password field is * (an account with no password set, which is normal for key-only accounts), and needs the machine to have at least one other account with a $5$ or $6$ password hash. The attacker then sends a very long password (257 to 1024 bytes). One user with a password is enough: it makes every account without one reachable. (same as above made stronger with the 'statement: statement2' format)
"Users coming from a directory service through musl-nscd (nslcd, winbind, sssd), since they have no shadow entry." (a human would be more clear about what a shadow entry is and give more context, I think)
Hmm the rest of the article (the remaining 70-80%) seems quite human.
Anyway, not sure why I spent 10+ minutes on this. It just jumps at me right away.