His account was compromised/password changed, according to AlexRus227 and Seclog, on April 29th, 2018.
He locked his account and made a report on May 02nd, 2018. There were about 10 messages posted by the hacker in that period (29-01), all bounty application posts or one-liners in the Altcoin section.
After going through manual recovery procedure, he recovered his account on 26 or 27th of Feb, 2019. Someone reported a post that was made around the time he was allegedly hacked (the very same day), he didn't have time to delete those, I guess he didn't even know they were plagiarized. I'm not sure who reported him, could be the hacker himself, knowing that those posts were copy-pasted.
What's interesting, I remember seeing all these posts the day he was banned, the plagiarized post was still there, there were bounty applications ... but now for some strange reason, they are all deleted. You can see some of his posts here ( unfortunately I did not archive them.) Kavelj22 pointed out the plagiarized post here but he also forgot to archive it.
To my knowledge, banned people cannot access/delete/edit their own posts, so how does then a plagiarized post disappear from AlexRus227 profile? He was banned on 27th and Kavelj22's post is from March 14th, meaning he was still able to see the post in question?