Note that this is not about the new guidelines, which will allow emulators on Apple's App Store, but an approval (or what Apple calls notarization) of the app on a third-party marketplace under the new DMA-related changes for EU residents. Although this was expected, because any other decision would have certainly caused a new incident with the ongoing investigation regarding compliance with the DMA, it is still incredible to witness an emulator being approved for mass distribution on iOS by Apple.
It remains to be seen whether Apple would approve a multi-platform emulator like Delta in their own App Store, where the new guidelines are still quite restricted in my opinion (a list of all possible downloadable ROMs is required there to submit an emulator, for instance).