"Unlike traditional valet parking, passengers retain possession of their keys throughout their trip."

"If passengers accidentally leave an essential item in the vehicle after drop-off, on-site staff will be available to retrieve emergency items."

But.. how would they get that emergency item if they don't have the keys?

You give them the keys, then they go to the site to collect your item.

I can remote lock/unlock my car from an app, so I’m guessing this is what they are thinking about.

First thing I thought, too. Seems like mutually exclusive features.