I'm not even sure what that term means.
There's positive doubt, negative doubt ... but systematic doubt?
Thank you for the response! Here it is within its full paragraph:
"Thus, far from making the sacramental action more readily understandable or facilitating its worthy reception, the new Rite of sacraments does otherwise. It relativizes the truths of Faith, reducing the sacred effects of sacramental graces. In this perspective, perhaps the sacraments administered according to the new Rite "might be in principle valid," IF THE MATTER, FORM, AND INTENTION are performed by a validly ordained sacred minister. To cripple one of these latter essential elements might consequently generate a doubt for their reception.
Certainly, it is not considered as a systematic doubt. It nevertheless is a serious and important positive doubt which must be considered both by the laity receiving sacraments and by the priests for a licit performance of the sacraments, and their validity."
-Ladislaus, the take away for me is that the above implies the New Rite is not intrinsically defective.