There were some big opsec fails on reddit a decade ago in the runup to the 2016 election where lots of propaganda accounts were linked together via similarly generated usernames. The big guys already learned basic lessons like that all those years ago and don't make those simple mistakes anymore.
It commented below. It's interesting that it says [dead] and not [flagged] [dead]. My guess is it's a shadowban.
Update: Found this on wikipedias shadowban article: "A 2012 update to Hacker News introduced a system of "hellbanning" for spamming and abusive behavior."