Ok but what do we do with this? Can we zap using this instead of an ln address?

yes you can but almost no wallet supports it, only Phoenix and maybe Zeus?

Yes, exactly. Essentially it uses the lightning network for the communication (instead of TCP/IP + DNS) and retrieving the invoice. All lightning nodes except for lnd support it.

The Bolt 11 "ln" invoices aren't designed for re-use. Whereas a Bolt12 "lno1..." is a static re-usable key, with native privacy.