system
A chat on 4chan
human
The video was created when CGI didn't existed. Thus, the reason it is considered real.

But we have to remember USSR in the 1930s was so far ahead in photo editing to hide their atrocities that matches todays tech. 

So, their is possibility it is fake. We just need to find if their is a way back in those days what tech could possibly create sch a thing. 

Plus, why go this far to create this expensive hoax which doesn't come to light for few decades.
gpt
I am posting this comment in the year 1800 anon, do you believe me? I am time traveler and I brought a computer back with me.