You’d be surprised at what he reveals. He opens up the machine, shows you the interior, and indicates the switch that allows you to configure the machine. Then he demonstrates how to configure the machine–everything from controlling the volume to controlling the payback percentage. Hit that switch, follow his instructions as to configuration, and you can hit a win almost every time.
What he doesn’t show you, and won’t show you, is how he programs the chips that constitute the firmware that controls the Random Number Generators (RNGs). He can program those chips, and he shows you those chips, and where they go in a slot machine. But he won’t tell you how he programs those chips on a computer.
I’d suggest that his hands are not the wrong hands, if his resume (as he describes it) is anything to go by. When I worked in a casino (and I did), we had a few slot techs on standby, if anything went sideways. Their honesty credentials were impeccable; I see no reason why this guy’s wouldn’t be also.
Not sure it matters so much to know how he programmed the chip (it’s not like nobody ever heard of EPROMs), as to document the hardware and software cryptographic protocols that would enable, let’s say me if I were a state inspector, to pull a chip from a machine and formally verify that it satisfies various constraints like executing the exact same program in the documented source code (which must also be public, otherwise we can’t verify that the RNG is random.)
Though he is completely forthcoming about the fact that the spins are adjusted so that a “hot” machine starts paying out less and vice versa, thus admitting that the game is absolutely rigged compared to “fair” games like roulette, etc.
If his programs are good, then it wouldn’t matter if everyone knows them. If it does matter if someone knows them, then eventually someone’s going to figure them out.
I knew a guy who used to work for a company that made the bill validators that go in vending machines. After a scandal in that line of business his company no longer allowed one person to write code. Small teams of coders had to approve each others’ work.
We purchased our own vending machines and maintained them at a club I belonged to. I installed new components in the validators a few times as they wear out. They don’t work like most people might think. They do not scan the entire bill like a copy machine. The validators use two small lenses about 1/4" across placed at two points across the bill. That is all they see, a pair of 1/4" wide strips of the bill.
Some programmer wrote his own “back door” where a piece of paper with specific dots on it would trigger his code. It vended a product, spit out the bogus bill and gave change. Not much money to be made, I guess but I am sure he laughed every time he got a free Pepsi and made a couple of bucks.