Wow, so that's why you only showed
the parlay that failed by one leg. If your account is limited, why not try a different sportsbook? There are so many options out there, you could probably find another one and just spread your bets so it doesn't get too obvious.
He posted that his accounts have been limited on every sport books. But I find this hard to believe. I will just say people should be very careful with someone like this, especially on KYC gambling sites. Very possible that he may buy the account, but nobody knows what he wants to use it to do. It can be money laundering.
It looks quite suspicious to me too, I wonder why a member here should have to PM him to discuss buying and selling of an account. He should've asked for information about betting sites that suits his need and any member that has the answer will direct him to the site, instead of requesting to buy account. Any high risk taker will know and will easily give the name of any bet site, without any need for private chats. As you rightly noted, people should be careful about selling accounts, especially the one that have their KYC, if the buyer uses it for any criminal activities, then they'll be held responsible for the crime.