I would guess that in principle, it should be possible to build it so that they don't know which Strike user has which npub.
Are they doing that? Or is there a database with npubs and identities somewhere? Would be great to know what we're dealing with nostr:npub12vkcxr0luzwp8e673v29eqjhrr7p9vqq8asav85swaepclllj09sylpugg.