That depends.. it would be more helpful to evaluate comparing to Doxygen if a more meaty C++ example was used. This is our std::vector implementation (below). The STL provides enough meat for any doc generator to chew on...
Did you know that the output can be customized in many ways, for example using CSS and templates? Many organizations use doxygen for their documentation, even though you wouldn't recognize it at first.
Also, whether the tool uses clang or a custom parser doesn't affect the HTML output in any way. I agree that using clang is interesting, but you seem to be depreciating Doxygen for all the wrong reasons.
Depends if you get rejected. Some of the apps we ship have been bounced back by apple 5+ times for very minor reasons taking up to 8 weeks to get approval in one very worst case.