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Looking at the video, there's a theory that it's part of the game.
The main thing is that it should not be used for harmful purposes.
Quite interesting lengths players went to using the steam console to track players automatically via custom software
I used to have a Team Fortress 2 server, and I’d say it’s probably a script or plugin that was custom-made just for this server.
Many admins of custom servers tend to push boundaries and exploit features for malicious purposes. Maybe that’s what you showed in the video, and that’s the situation.
However, there's no way to be certain. You need to keep searching for more information.