"This is his attempt to knock ATP as a get there quick scheme..."

Actually, it wasn't, but now that you mention it....

LAFF is a private pilot and has never trained at ATP.

As you look around at schools, if Rainbow Air seems like a good place to train, then knock yourself out. I'd be wary of a place that promises this and that, when it comes to experience in advanced aircraft, or employment. The industry doesn't work that way because it's not necessary.

Like I said, shop around, and take your best shot. No problem with me if it's ATP, either, but I'm not a fan of going from PPL to CFIMEI in 90 days and then starting to teach the next guy.