It's definitely clean tf2. That's exactly how it looks like (note how some props don't have flat materials so you know it's not a lod thing, or how that soldier's burning hat's fire particles looked) and that's exactly the same error message spew you get from using it (from using a basic shader to both get rid of lighting and to increase fps, which also doesn't support a lot of the fancy stuff more advanced shaders use, fortunately only giving off errors).
It unfortunately won't work in sv_pure anymore, but I mean there's no harm in using it for when you do run into sv_pure 0 servers.