At those success rates, he's going to need a lot of students working for long enough to exit to yield statistically significant results. How long has his program been open?
I bought it two years ago, and according to Gumroad, the version I bought has made 3,499 sales. It might be more due to different versions of his course, and it's certainly not much fewer than the pool of 4,000 he's using to calculate the failure rate for YC founders.
