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They found the shooter's Steam profile. And he worked as an intern on Civilization 6.
(www.pcgamer.com)
Tabletop, DnD, board games, and minecraft. Also Animal Crossing.
3rd International Volunteer Brigade (Hexbear gaming discord)
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I think the first video said something like "if you see this I've been arrested".
It would make sense to set a video to upload on his arrest. But making it a teaser then scheduling the real video for later was pretty dumb.
If he had just uploaded the real video from the beginning people would have downloaded it before it got taken down.