This scheme doesn’t really make sense. Once you’ve convinced a wealthy person to play at your underground poker table, you’ve already won - just play better poker than them, ultra wealthy fish don’t have time to learn to play perfect poker and you do. Trying to extract slightly more money per hand via x ray tables etc kills the golden goose and doesn’t even necessarily increase total winnings, since it makes you win…
“just play better poker” like that’s an easy thing to do in a game of chance and incomplete information, with variance having years or decades long tails. not to mention it’s an unsolved game, so “better” poker doesn’t even really have a set definition and depends on tons of variables. and they literally knew what hole cards were coming - that’s vastly more of an edge than playing “better poker” than someone. Besides…
you just need to beat the table, you don't need to become an over-average pro.
that decades long tail you mentioned is for pros chasing profitability in tournaments -- it's a much shorter tail when you're playing fish in setups.
being better at poker than the guy at the table who is good at making money isn't a big leap, it's what sharks and hustlers have been aiming at for hundreds of years.