We couldn't see this within a year of it happening why? Why exactly?

But now that they've had plenty of time to edit, cut, splice, or AI together a bunch of footage of an empty hallway in front of a cell with timestamps on it suddenly we have proof that isn't that definitive but would have been more convincing if released within months to a year of his death.

I'm calling it that this is just footage of a hallway with no view into the cell, footage that could have been edited together from footage from previous days or later days, it may or may not show guards walking up and down. At most it'll have time-stamps hard-coded into the video stream but anyone with access to the facility could record video from that angle after the fact and add in their own hard time-stamps that match those used by the systems in place at the time. It would be possible pre-AI to do this kind of manipulation and fakery with a single experienced Hollywood film editor but AI could definitely be used to make it more convincing especially if you're trying to insert a now dead guard into the picture.