I may be wrong but I think the stffness has not been decreased. Babolat states 70 RA for the 98 and 72 for the 100. The dampening system is supposed to improve comfort of the new models. Whether this dampening system has a striking effect remains to be clarified by users.
As @haqq777 mentioned above, the RA rating does not fully show the comfort of the racket so don't go by that alone. I have been playing with the new pure strike 100 and I played with previous version for the longest time, and the feedback is very different for me even though on paper they may be same RA. The newer one plays more muted and smoother and less vibrations. Previous one was definitely more pingy too. I use Hyper G string at 52 pounds...Thanks for your feedback. You measured 68 RA strung, while Babolat provided unstrung RA. There is no real discrepancy between these results. I read other reviews from some players who just found a slight difference in feel compared to the 2017.