Singer has no standard. He knows he has spent no time or effort to validate his system. Singer once claimed there were 3 mathematicians that had reviewed his system. Of course, they were all from foreign countries and could not be reached through the internet. It was an obvious lie and became a standing joke. It's similar to his other actions. His claims about hot/cold streaks, his claims about the 5th card repeats, his claims to have inside information from IGT, his claims that the NV gaming commission is in cahoots with casinos, etc. They all feed into the typical naive gambler paranoia. He feeds on the fears and superstitions that surround gambling.
As far as I can tell he developed his system for one reason. To try and make it appear he was some kind of VP expert. Singer is intensely jealous of any and all of the well known VP gurus. I think he wanted to be one of them but failed to get any recognition. He then went off on this anti-establishment route to see if he could gain recognition. I suspect his entire reason for developing his system was ego. Using it to garner free comps was likely just a side benefit.
You'll notice that if someone says nice things about him, Singer will praise the person, but make one negative comment and he will throw out tons of insults. Text book narcissistic behavior.
PS. I'm pretty sure Singer knows I have a degree in Math.