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You should have searched for the open accusations just like you did to search for the accusation and posted it here, its not that hard and hardly takes any minute. Auto-buy sites or anything from personal sites are mostly scam. Don't trust them first with the money. There are lot of traps like this on auto-buy sites.
Plus you neglected the feedback on the user's profile.

Correct, and (@adam12x) as newbie yourself this would have showed up right above his name in his thread whetehr you were logged in or not:

and/or this:
health and fitness goals for 2019It is sad and I am sorry you lost your funds but you obviously didn't believe his big yellow tags.