Lol fair enough for wanting to distance yourself from any wannabe-cheaters. As nebula said, you can click the name of a user and it will show their join-date there. You joined back in April so you weren’t in the group of accounts that I was mentioning. Another way is the colour of a users name in a specific topic. If the user joins after a topic is created, then their name will be displayed as grey. Another handy feature of Discourse!
I’m not sure if there’s any way currently to determine if a forum account is the same as a site account. Maybe something to suggest to lonin?