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He's pretty much full of it. He's copying a few things that have some validity (like Verkhoshansky), but most of it is probably bits and pieces he read from some article in some fitness magasine somewhere and his own imagination.
In regards to squat strength and vertical jump height, it's debatable. In this study, they found no correlation between a 1RM squat and vertical jumping ability. That said several studies have shown some (even if slight) improvements in vertical jump height after the implementation of a squat program. The optimal squat depth for improving vertical jumping is debatable as well. This one, and this one, saw better results of overall performance with a deep squat, and this new one actually saw bigger improvements with quarter squats.
In regards to olympic lifting, there's pretty good evidence that it improves your vertical to a significant degree. It makes sense when you think about it. The olympic lifts are mostly explosive movements initiated from the ground that work triple extension, meaning extension at the hip, knees and ankles. Triple extension is also used in jumping. It's a bit more complicated, and obviously it's not exactly the same, but as a loaded movement it's very close.
This metaanalysis, posted in the British Journal of Sports Medicine last year, concluded that olympic weightlifting and plyometrics were about equally effective in improving vertical jump height and in this one olympic lifting provided more all around results than jump training. A metaanalysis, if you don't know, is a quality review of several different studies.
I'd like to say that you always have to take studies with a grain of salt. Some hold more value than others, but you always have to be critical. Who were the participants? (were they trained, untrained, sick, healthy, big, small, young, old, many, few), what was the intervention? (did they all do exactly the same, did they eat the same, did they sleep the same, did some train harder than others, did some respond better), is there any bias and how good is the science? Point being, studies is the best we got, but they're not perfect.
As mentioned earlier there's pretty high evidence for olympic lifting, jump training and plyometrics improving vertical. The evidence for squats is probably moderate, but it's a good exercises in that regard nonetheless.
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