When on a taco, they're not allowed to move the vehicle, it's the rules
On a taco they’re allowed to drive an excess hour twice a week. When they’re coming to the end of a timing session, the driver is required to sto safely and legally. A taco doesn’t mean “4.5 hours, slam breaks on and stop anywhere”.
They’re also permitted to move in an emergency. Although this wouldn’t apply here as the driver could “reasonably foresee” there could be an issue.
And it would also be an even worse breach to get someone else to drive, even if he had the correct licence, insurance, permission from his employer and cruicially, his own tacho card, because driving on someone else's card to get round rules about breaks is a very serious breach
To be honest, if he’s enough of a dick to park over someone’s drive, I wouldn’t be that concerned about any breach.
I think we’re getting into the realms of fantasy to excuse this bloke. Had he been genuine surely he would have explained with an apology.
Occam’s razor, far more likely the guy is just a prick who enjoys petty little power plays.