No idea what, exactly, this guy’s doing. But he does illustrate the point that Union Station is an unfriendly place that’s extremely stingy with seating.
Union Station is mostly wide spaces with no seats. What seats there are are restricted to special travelers, or customers of fancy restaurants and shoe-shine services. The large courtyards are almost void of seats, except, again, for the paid dining seats.
Union Station is the hub for Train, Bus, and Metro Rail transportation in Los Angeles. Just don’t expect to find a seat there.