Brenton Speed's explanation (camera not on back of post/line or same width as posts):
View attachment 9967
Perhaps. But if that's actually how it's set up, it's not of any use to decide scores. The reviewers can't guess and say "allowing for the camera angle...". It's not even 100% reliable for goals, especially for marks close to the camera.
Surely they can attach a brace so that the camera is actually flush with the goal line and pointing along the line. The goal review system has been a real mixed bag and I'm not sure we're better off than when we allowed the goal umpires to make the decisions and never saw any contentious camera footage.