Definitely too many to be random. I think they are all mostly soviet era things, no? So the author is likely an émigré from the USSR.
Why émigré? He is probably Russian.
Well, not to put too fine a point on it, but it would be more correct to say that the author/artist is likely from a country that uses the Cyrillic script.
>..the site’s developer Pavel Sannikau is always working on new rooms for floor796. Sannikau is a 36-year-old web programmer living in Belarus
From 2023 article https://www.cartoonbrew.com/tools-of-the-trade/floors796-pav...
The guy was active on Reddit a week ago https://www.reddit.com/r/gifs/comments/1pqktaj/new_block_56_...
Author is from Minsk, Belarus. This information is in his profile on Artstation