He posted on the old reddit DAR sub before it got banned, using the same username and he got caught doing this. I haven't checked, but I assume he has since deleted this reddit post. Other users would call him out for this on the old reddit DAR sub, so i guess you could verify by looking at an archived version, if such a thing exists. I have no need to though, since I remember all this.

Edit: found it

https://ihsoyct.github.io/index.html?mode=submissions&subreddit=&sort_type=created_utc&sort=desc&size=&before=&after=&author=Ayotollahsiniran&score=&num_comments=&q=

Screenshot

https://ibb.co/qpQTt43