Clint even describes the injury as he points to it as the right rear quadrant.
How the hell is that spot the "upper right
rear quadrant"?
Anyway, because "Mytton" has a habit of dishonest out of context graphics, I dug up the actual video clip.
If you watch the whole thing, you realize that Hill isn't just describing things that he saw. He's talking about things he was told. Like the supposed neck shot that came out the throat, which he also points to (even though he wouldn't have seen that) and even describes a shot that he didn't hear but was told about.
Interesting also that he also says that JFK's head was on Jackie's lap and that she was grabbing at brain/head material on the trunk when she was out there.