Does Ponting has a right to appeal there? Absolutely yes whether he knows the batsman is out or not. His job is to get the opposition out whichever way possible within the laws of the game and he is doing his job. It is for the umpire to decide whether there is a catch or not. But Holier than Though attitude just because once he declared a Non-Catch? Just because Mr. Ponting says something (as a fielder not as a batsman mind you), everyone must believe him because he is the Australian Captain.
So, let this garb of selective honesty be taken of. Just let the world know that you are here to play cricket and win. You have a job to do %u2013 score runs and get opposition out, umpires have a job to do %u2013 to decide (which is another topic to write volumes on) and get on with it. Do not harp on this credibility and honesty stuff, on taking the word of the fielder, on turning in to a saint from a selfish run hungry batsman.