I assume you’re describing a Tesla procedure, which admittedly, I am not familiar with. But the article is referring to digital key via phone or watch.That only happens when you have the “Driver door-only” mode toggled on. Turn it off and all doors will unlock upon approach.
You get two card keys with the car, you just hand one to the valet.
I think the question about valet still stands. If I need to still carry something besides my phone or watch, it doesn’t seem any more useful than the key fob I’ve had in my last two vehicles (Or the physical cards, if that is how it works on a Tesla).
I have digital key on my phone that I can use to open and operate my vehicle if I don’t have my fob, but it seems carrying the fob covers all bases.