Evidently I spoke too soon re: this using BLE and not NFC.
The original plan for this was indeed to use BLE (hence why 2nd generation Touch Points have BLE support, etc.), just like the existing Digital Key solution for hotel room locks (using the Assa Abloy Mobile Keys SDK).
Apparently that plan has been scrapped, as I've since been informed that this solution will be NFC based (at least on iOS) and will utilize Apple Wallet (via a special partnership with Apple). That means that features like Express Mode (which allows you to tap/scan your phone without FaceID/TouchID, as well as use it for several hours after the battery dies on newer iPhones) will be available.
I would expect this to use NFC on Android also, especially since Android's NFC APIs aren't restricted.