How Do Hotel Handicap Emergency Entry Buttons Work?

Take a look at this hotel door:

This Onity Advance RFID lock is an offline, NFC credential style lock.

If it's offline, how does this emergency override/unlock button work? By design, you don't need a card, you just mash the button to gain access. How can this be secure?

I pestered the manager until I found out, but I am curious to hear your guesses and inputs.

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