You gave your own little spin on it. Just as you are doing now.
The man is arrested for espionage and attempting to foment a civil war.
Funding opposition sources would be evidence of that as would video of him conspiring to do as such.
The video with Rivera is almost certainly an interview. It makes no sense for him to come up to a guy with a camera and start giving out instructions. Rivera has yet to be arrested, so the full video very likely shows an interview format (indeed, the other Spanish speaker is clearly talking to him in an interview format and writing down what is being said). The condom guys have been arrested because talking shit about causing violence is a big no no (you can get arrested for that in the US; indeed some Occupiers were infiltrated with psyop agents and convinced to actually go through with their smack talk, once the Molotovs are made you're sitting on a felony). So that video isn't really evidence to prove the filmmaker committed espionage and attempted to foment a civil war. Indeed, that's the very kind of footage a documentarian is supposed to get.
The video of the idiot thugs, likewise, doesn't prove a conspiracy to do anything. He's filming idiots mouthing off.
All they really have is the fact that he used his dad's air miles to get back. Basically he came into the country with money and left needing someone to fly him home. It's possible he paid off some people, it's possible he was robbed (probably likely, really, given the rampant crime in Venezuela). But that's not evidence of anything whatsoever.
I suspect Tim, unlike many other Venezuelan prisoners, will be released shortly. His family will likely bribe the requisite individuals and he'll be on a plane to the US in a few weeks.