Prius v (2015 wagon) low beam removal issue(?)

I'm probably asking something that has already been answered, but I read through the other "replace low beam" threads and saw no mention of this.
I am trying to replace a burned out H11 low beam on my 2015 v. The low beam bulb looks like a halogen (looking in from the lens in front) but the rear socket portion is not like what's mentioned in the 'replace low beam bulb' threads.
Looking from the engine-compartment side, there's a grey plastic dome, approx 3" in diameter, wiring socket in the middle. It's where the rubber gasket (81175) had ought to be (based on parts diagrams). It looks as though that dome is supposed to come off somehow. It has small lips around the outside that look as though they're to accommodate fingers. I've tried twisting to the left, and when it didn't budge in that direction, to the right.
I've got decent hand strength (people hand me stuck jars to open) and those flutes make me think I'm not supposed to use a tool.
The bright side here is that it's the driver's side, so it's somewhat accessible - and I know I've got an issue without unbuttoning the stuff in the way of the passenger-side one.
This is turning out to be harder than a gen 2.
Any ideas?
Thanks!

 

Looks like you're right. Guess I ended up with the $$$ headlamps.
Assembly looks like this one on ebay listed as a LED unit (top picture) and the dome is over the socket which I've cropped out (bottom picture). Still, the low beam bulb is burned out. Looking in from the lens side, it looks exactly like a single element halogen (little glass nub at the top, support to hold filament inside) not a LED. I guess I could take it to the dealer, but as a DIY person having a pro do something that should be so simple as a bulb change strikes me as... wrong.