I have spoken to someone who was also very skeptical so he went down and flew it.
Both were very impressed and quite happily confirmed the claims of top end speed and stall speed.
The changes listed from the A22LS add up to quite a long list and many of these things on their own might make very little difference but in combination, all the little things can add up.
It appears that yes there are some big changes in shape and aerodynamics but there are also a lot of little things that all help.
The one thing that does bother me is the very small gap between Max cruise and Vne. Not much room for error there especially if used in a training environment.
I agree and this really could be a game changer for Jabiru, I would love to see a head to head comparison between this and the J230. Cost wise there is not much in it and this is a far lighter aircraft with better stall and similar cruise. Oh and that Rotax up front.