> He seems to have achieved the IM Title decades ago, today he is probably simply a weak player.

Wow.

Regan has been an active and respected member of scientific community, a lecturer and book author for a long time. If anything that adds and not takes away from his credibility. He's also the most prominent expert on cheating detection that FIDE has ever worked with and he's an authority on the matter.

Oh, and he's rated at around 2400 ELO. But I guess it's very easy to just slander him like that. Go back to reddit.