While iOS is an umbrella term, the App Store is pretty clear about which devices an app supports. The device range is explained right beneath the screenshots, and the Compatibility section goes into more detail. In this case iPad isn't mentioned, so are you looking for some clear "no iPad" signal? If it will run on iPad, just not as a full-frame iPad app—because a few really won't run at all, like if they require a hardware capability only a phone has—how could they make that clear? In the storefront signal-to-noise game, is it worth the attention?