http://www.ebay.com/itm/2011-W-American-Eagle-MS-punch-error-/330710208401?pt=Coins_US_Individual&hash=item4cffdd4f91#ht_500wt_1413 What is a punch error supposed to be?
No idea. From the description, it sounds like PMD. Especially because the indentation appears on the back of the coin. It isn't a mint error.
I think what he's trying to say is that he thinks it is a strike through error but he did not know the proper term. I believe he's talking about it being the 5th time for the mint to offer the burnished ASE.