Well, it's just that most pop musicians don't know shit about the specifics of how jazz is made, most jazz musicians don't know shit about how pop is made, most classical musicians don't know shit about how anything else is made, and everybody thinks that hip-hop musicians don't know shit about anything, yet they couldn't lay down a phat groove if their lives depended on it. Hell, most chefs are more "versatile" than most musicians. They respect the vastness of the world's various culinary cultures. Musicians tend to tribalize themselves. Why that is, I don't know, but I don't know that it's ultimately a good thing, not today. Maybe in the times when localized tribes were essential to survival, but those days are rapidly approaching being over. Live in the old world, die in the old world. If that's what works for you, fine. But I'm not ready for that just yet. To use Oliver Lake's "all my food on the same plate" analogy, when my plate starts getting full, I'm just going to get a bigger plate. What I finally end up eating in quantity is another matter altogether, but dammit, I want at least a taste of everything.
Most of us learn what we need to know to make what it is that we want to make, and, at best, the basics (or a little more) about that which we like but don't make. That's probably how it should be, but I'd no more expect a hip-hopper to know the specifics of "Giant Steps" than I would expect Sonny Rollins to know how to effectively put together a collage of samples that gets your attention, or for Yo Yo Ma to know how to layer a rhythm track that forces you to move your body whether you want to or not. Those are distingly different skills for a distinctly different music with distinctly different motivations, means, and ends. And no, not everybody (much less anybody) can do it.
We're talking "craft" here. Craft is part of the beginning of art, not the end of it. You don't have to respect it for more than it is, but to dis it entirely is just wrong. I give this guy credit for at least having his mind open to Coltrane, and for at least keeping it on his "things to keep getting into" list. That's more than most pop musicians do, and, turned the other way, it's more than most musicians of any type do.