I’m not sure I agree with that, Arch 100% should continue to be mentioned. Just because the Trojan didn’t launch due to the fact that Arch’s environment didn’t meet its criteria, doesn’t mean you should keep a known malicious package on your system.
People keep preaching to the heavens that Arch was not affected by it, but they don’t always state that Arch was infected by it, it just never binds the library to SSHD like Debian systems do (for systemd notifications) so the attack vector is never made.
The arch Wiki official statement on it is that you should remove the malicious package and do a full system update. Which should be common sense, but people have to be aware that the system is infected by it in order to know that they have to remove it. A process that if Arch was never mentioned as being involved users wouldn’t think to do