Asking if they've trained elite lifters is like asking if your local primary school teacher has taught any PhDs.
That's not their job, they're there to get people started. Except in this analogy, strength training and primary school, it's like it's the 19th century when most people didn't finish grade 6. In a world of illiterates, successfully teaching basic literacy is pretty remarkable.
"What?! Rip never coached any elite lifters? Well obviously he is a crap coach, then!"
"What?! Mrs Jones never taught any PhDs? Well obviously she is a crap teacher, then!"
Spritcha, I think you are falling into that trap I mentioned, being so advanced that you forget just what is needed for beginners, and how important it is to have a good coach when you start. This is a world where if a 59kg guy gets to 65kg and squatting 75kg and deadlifting 110kg in 10 weeks, then qualified trainers will seriously suggest he must be on steroids.
When it comes to coaching, Rip doesn't present himself as anything more than he is. He has a lot of stupid ideas (eg he doesn't believe in global warming), but his ideas about training beginners are not among them. His advice is, for beginners, solid - and works.