They have to expect to figure out how to make non-terrible AR glasses in the nearish future. There's no other explanation for why they (and several other companies) keep dumping money into AR tech that's cute to use for a couple minutes, but otherwise terrible outside some very niche applications, on current devices. They want to be ready to take advantage of the new tech on day one, when they finally figure out how to package the hardware.

Maybe it won't be this year, but I 100% expect to see widespread AR glasses becoming the next smartphone revolution before 2030, if only because so many big tech companies seem to be betting big bucks on it. Certainly seems more attainable than self-driving cars.

The reflection off the screen reads "Calendar", "June 7", "21", and the Xcode and Terminal.app logos. Don't read too much into it - those are just the usual "parameters" of the event.