I'm checking their post history.. I'm honestly not sure what to make of it.
https://redditmetis.com/user/thanosrain
Account created October 14, 2019
135 total comments
102 of which are in /r/QAnonCasualties
Other top subreddits include HermanCainAwards, CovIdiots, and Quit_Headquarters.
Some comments in AskReddit and others, almost exclusively about covid.
This doesn't say much about the persons identity, but they're clearly not coming to the site to have fun.
Submission by weekday is also interesting, high on weekdays, low on weekends, highest on Monday.
I hate to be skeptical because I have doctor friends that have similar covid stories, but this post is quite sensational, newsworthy even. I wonder if the user would be receptive to verifying themselves with the mods.
edit: their first comment is March 3rd, 2021 and first submission is March 2nd, 2021. Nearly a year and a half after the account was created.