Haven't watched the video but Russia would be a good bet.
Nope, some nobody wrote a crazy book. Then came the internet. Pretty interesting really.
Unsurprisingly it is listed under Soviet active measures against the US - though it lacks citation here:
https://en.wikipedia.org/wiki/Active_measures#Against_the_United_States
I'd be surprised if they weren't involved in some way. Interestingly a majority of the Russian populace believe it was faked:
https://www.rt.com/news/444790-russia-check-americans-moon-landing/
My guess is you're right. Like interfering in elections, espionage, etc. it's in their best interests to stir disharmony. So, yes, likely now that is the case, but at the time, had they had any legitimate proof against the moon landings, it would've been a massive worldwide scandal. That didn't happen.
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