As BORN suggests there are actually two types of aces / hole in ones in WGT. There are the stroke play hole in ones that show up in your stats and their are the BLITZ aces that show up in your stats as well.
Some of the BLITZ aces are harder and better shots than a real hole in one in stroke play but they are 2 different things. I think the long ace that was made at Bali was hit from a spot in the fairway and in Blitz courses obviously you can make a putt for an ace on some courses.