This is actually SCP Beta 4, not 5. You can tell by the direct path to the level exit in the Earth basic training. And... ugh, he's using SHTUP beta 1. I'm thinking this guy grabbed a modpack.

Also double-ugh, he's a total douchebro. I'm losing brain cells just listening to him.

EDIT: At 52 minutes he actually lists all the mods he's using.