What makes you think the aircraft that is at the hold short line is stopped? It is likely taxiing to runway 34 for takeoff and not stopped on the wrong side of the hold short bar for the wrong runway.
Does it matter?

It illustrates the point in a very good way, for me it wasn't immediately evident that in the sentence "those are the hold short lines for the runway behind you", "behind you" was referring to the runway, not the hold short lines, the picture made it abundantly clear and now when I listen to the clip I can no longer not hear the intonation implying the runway rather than the hold short lines.