I am gobsmacked by your position, Tridentinus. 

Everyone agrees that there have been two instances of ex cathedra pronouncements. I challenge you, with a straight face, to make the case that JP2 apostolic letter in any way parallels those instance in terms of solemnity?  Among other defects here is the obvious decision to invent a new term "definitively declare" rather than the obviously available "infallibly declare." We have no right to infer intention on such a matter when the pope explicitly avoids the terminology of infallible. 

I have been unable to find it in the intervening years, but I recall a report that JP2 had wanted to make his declaration infallible, but was dissuaded by Ratzinger (of all people!). That is just rumour of course.

BTW, I know there are conservatives who regard non-ordination of women as infallible because of Ratzinger's CDF response, but that is based on a judgement about the universal ordinary magisterium. 

Sorry, but I consider you position absurd.