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I would find this a more compelling argument if some of the apps in question weren’t from Apple themselves (Apple Shortcuts, Apple TV). If Apple can’t get it right, then how can we expect anyone else to?
The Apple TV example looks a bit disingenuous, the huge black space normally holds an image promoting one of the shows. That’s why it has so much space. I don’t know why in his situation the header is empty but that has nothing to do with layout on small screens. You could complain the promotional image is too large but it’s really obvious you can scroll down to reveal the rest of the content and I don’t think anyone…
Uhh, I scrolled just like the emoji keyboard (which every iPhone user has figure out) and it worked? There are also partial icons at the edge hinting of more to the right. This wasn’t/isn’t exactly hidden.