I'm aware of what Counter Strike is, I develop for the engines. My familiarity is what makes this so suspect. The hud graphics are a mixture between the styles of the GoldSrc and Source games, the crowbar is colored like the HL1 crowbar but has too much detail, the trees in the background look like random polygon blob, and the reflections are likely impossible. I think this is AI.

The thing is, if you look closely, the crowbar doesn't make sense. If you look at the base, it's a more rounded shape with a clear line going up, but as it nears the silver, that line fades into an indention like the crowbar in the Half-Life 0.52 alpha had, and then at the top, there's what seems to be a random jagged piece of geometry poking out.

Edit: and on top of that, there's other things that point towards this being AI. The pixels at the top of the shield icon are a bit nonsensical, the tiles are scaled weirdly, there are random spots of green light to the left of the pool and on the monument (likely the result of a "green glow" prompt), and some of the assets appear to be visibly pixelated while others don't.