Sorry about that....here is their sitdown though and where he discusses it
I was able to skim through most of this and watched the part in particular. He brings up a quote when Hamman said the guys beating him were just stronger and displayed a lot of strength in the backroom. A lot of the interview is leading up to that as he's trying to find out what type of training Hamman was doing at that level. Hamman makes it clear that a lot of heavy squatting was going on at the training center, including maxing out. Hamman says guys were squatting and getting stronger there, but he slacked off because he thought he was strong enough and needed to focus more on learning the lifts since he started late on them.
This leads into where Rippetoe talks about deadlifts and lack of them in a lot of programs. He brings up Kendrick Farris having a strong deadlift and his coach being one of the few that train it. I think Rippetoe was really hoping Hamman didn't bring up all of the squatting, so he just started obsessing on deadlift at that point. Overall though, I don't think anyone can disagree with the point that being stronger obviously helps at the oly lifts. He mentioned cleaning something like 220kg is going to be a lot harder if your deadlift is only 230 kg vs. something like 260 kg.
I really don't think most coaches ignore that either though. I know I've seen a few videos where they talk about this. Specifically, I know I've seen it in Cal Strength where he was talking about a lifter who is really efficient and the oly #'s being very high in relation to something like their max squat and front squat. That is definitely something that can happen to people learning oly lifts early without much of strength base. But from what I've seen in most oly training videos, they are training squats, clean pulls, etc. to get stronger.
The bottom line will always come down to the lack of interest from an early age in America, lack of funding, USADA, smaller pool of athletes, etc. If you have an oly lifter learning technique from an early age, at that point, they can put a lot more time into getting strong as well. Their technique isn't just going to go away. In general, I think American lifters are playing catchup.