What he did was not official. Now the lower court gets to decide what is official, and it's being intentionally slowed down until AFTER the election so the current admin can't go ballswild with the new allowances. Fuck these Maga-locing shitheads on the SC.
It happened before AND after he was out of office, and they were caught on tape moving locations. Knowingly relocating Presidential documents outside of the chain of command in itself is a crime. It's technically treasonous.
Intent is proven by subjective knowledge of what he knew about the law, and his internal staff have already testified he knew of the existing laws. There's also recent recodings of him saying so and worrying about a crime being committed. He knew, and illustrated such, it's not a hearsay case if he's on tape, and others acted at his direction, which again, is already on record.
The ruling explicitly states that those things on the record are not admissible if they were not through some public form of communication. So his phone call to the Georgia governor would be inadmissible even though it is currently public knowledge since it was originally a private call he claims was official business.