Look how the Zapruder film was kept hidden from the public until 1975 when Geraldo got his hands on it and aired it.
That is completely different. The Zapruder film was studied exhaustively by the Warren Commission, as would be expected.
Subsequent disputes between the Zapruder family and news organizations over film rights to this potentially valuable piece of history offer a reasonable explanation for why the public didn’t see it until 1975.
What’s fishy about the NBC film (assuming it shows what Luna is alleging it shows) is that - unlike the Zapruder film - it is inconsistent with the Warren Commission’s findings, and was either buried by, or withheld from, the commission.