Can you think of any plausible reason that this would aid a cover up?!
It could be as simple as the TV broadcast signal du jour was incompatible with the video cameras used to make the footage, and that this was the simplest solution.
For the simple reason a 1960s tv camera filming me running around the garden, then being shown on a 1960s black and white tv, then being filmed on a 1960s camera and being shot across 1960s analog satellites and being shown on finally on a 1960s tv .....would have looked like I was on moon also
Sorry for the long sentence, but it's a fair point