Based on the release of multiple emulators in the App Store in the past few days (including Delta which looks like it is here to stay), it looks like I got this

Based on the release of multiple emulators in the App Store in the past few days (including Delta which looks like it is here to stay), it looks like I got this wrong. My original comment made sense to me based on my reading of the rules, but it looks like they really are allowing open-ended emulators that can load ROMs from anywhere.