This video is very interesting...
If not for the theories, then for the many peculiar facts I didn't know of until now.
I'm not sure about the 75 years missing the date of the broadcast by 1 year indicating the original intended release for P.T.
I think it's just as likely that due to it being delayed, they just didn't bother to re-record that part.
However, the 204863 number being the reason the "father killed the family" sounds like it isn't a coincidence. At least not the number part.
Since it's Kojima, I can see him doing things like this, given his history with hidden messages.
And this makes me more interested in playing Death Stranding.