Jokes aside, a lot of devs love watching stuff like speedrunning. It means someone loved their creation enough to minutely analyze it and spend countless hours with it.

eg check out the devs watching a guy beat Psychonauts https://youtu.be/lsDc1YVxHA0?t=517

(I’m pretty sure there was similar version of this where they guy wasn’t in the room and they were just watching the earlier recording of the speedrun but I can’t find it now)