It’s never done in practice, though. What they always do is simply turn off the contactless readers and block every single form of contactless payment. Like Walmart did. Plus the original question was whether they could choose a specific mobile wallet and block it, which they can’t. They may be technincally able to distinguish between contactless cards and other contactless payments, but that’s it. They can’t, say, specifically block Google Pay and still allow Apple Pay.
Agreed. However, blocking all mobile wallets may be enough if you're assuming that a lot fewer people are using Google or Samsung Pay vs. Apple Pay. If nothing else, the latter has way more mindshare than the former two (hence why contactless is known more as Apple Pay here than anything else).