EatMyShorts
The consensus of opinion I have heard is that the charges probably relate to the basis of the flight, not the cause of the accident. The aircraft was not registered in the EU, so it is very unlikely to have been a legitimate charter.
There are only two other options, a private flight or an illegal charter. The way people sometimes try to get away with illegal charters is by saying "he was a mate, he only paid me some of the costs to borrow my aircraft" (which people get away with sometimes). If not true, that might be considered perverting the course of justice, although only a court could decide of course.