Actually it allows emulators on the standard Apple AppStore (after review). Ignited is working of submitting.
Edit: source right from Apple’s website. This is the review guidelines for all apps on the AppStore, not just Europe. My guess is that they decided to include the emulators to keep control and retain customers in their store instead of them going elsewhere in EU. And they had to make it the same rule all over to keep it consistent.
Installing AltStore on your US-based iPad or iPhone is pretty straightforward, as simple as sideloading can get in 2024, tbh. You will need a PC or Mac to do it, however.
Ah, my US bias is showing. You could still follow the directions in the link, or wait a couple weeks until the AltStore goes live in the EU and get Delta the easy way.