100% made up bullshit.
Brock would do it yes. Austin would do it, maybe? He probably won't, he has never said he has a desire to have another match. Until he completely changes his mind, it's not happening. Why throw out a bullshit number like 35 per cent?
Either they can convince Austin to have one more match or they can't. That is what matters.
The point, I think wasn't that Austin had a 35% chance of doing it, but that he had a 65% chance of NOT doing it. Ross was trying to stress, once again, that it probably wouldn't happen.