Alternate dimension where things are a little different. It's not the future, history just a little different recording a different year 0AD start. So it's now.

There is sound, you can hear it when there is no background music.

Not Virtual Reality, he films himself several times, setting the phone down and recording himself walking and records his reflections in windows and different things.

There is even a stationary drone in the stadium shot. Drones are stationary hovering with no input.

He does turn the TV on. It's just digital static with no broadcast.