Aye, that's my understanding. As for using the wrong frame, I have no idea what the FPS rate is. So, this might be the best one. As others have said, we are trying to claim absolute accuracy from a botch up.
About the red and blue VAR lines...
A guy on P&B has pointed out that these are misleading. You can see it on the BBC highlights if you freeze it and peer closely. They take a vertical line down from the attacker and defender. Then draw the lines across the pitch from these positions. It's a 3D to 2D compensation thing. And Casey IS in an offside position. Of course, even in 2D, you can see that the ball is already in the air, so they have done all this technical stuff on an incorrect frame.
My recollection is that we got Marinello for nothing. Portsmouth didn't pay the agreed compensation for taking our manager - Ian St John - and we got him in lieu.
But it was a long time ago, and I haven't checked.