WHAT IS THIS... THING? (Portal: Forbidden Testing Tracks)

So I was just playing pfft, and while playing chapter 6, I found this.

Is that just an easter egg that does nothing bc when checking my instant replay, it was standing still, or is it a weeping angel of some sorts?

If you know what this is, please let me know! I realy want to try and finish the mod, but I don't like horror games that much and I hate jumpscares even more, so if answering, please don't be a troll!

the black figure in the background