Do they even read the HIG themselves anymore? The latest iOS is a shit-show and full of inconsistencies between iPhone, iPad, and whatever you think would be considered “common sense”.
Apple's "services" apps–App Store, Music, Podcasts, TV–are the worst apps on the platform, period. They're so awful that I cannot understand how a sane developer could ship something like that.
To enable/disable shuffle after selecting a song, you must tap a bar near the bottom (which gives no visual indication that it expands); once expanded, you must then tap an unlabelled button with a “list” icon. This will show your upcoming queue, but also holds the control for shuffle and repeat. These are also unlabelled, but at least the icons are fairly unmistakable.
That was fun to look at, but I see you also have an issue with UI/UX on your website: you cannot easily reach the footer when scrolling down because of that infinity scroll.