"We declare that we recognize the validity of the sacrifice of the Mass and the Sacraments celebrated with the intention to do what the Church does according to the rites indicated in the typical editions of the Roman Missal and the Sacramentary Rituals legitimately promulgated by Popes Paul VI and John-Paul II."

• "The new rite is certainly illegitimate.

• The new Rite that Paul VI intended to promulgate by his apostolic constitution Pontificalis Romani is certainly illegitimate by the accuмulation of two reasons: firstly, because no pope has authority to destroy the Roman liturgical tradition and much less so to invent a rite that is in rupture with the whole of Catholic tradition; secondly, because the contamination with modernist doctrines causes harm to the faith, and a decision contrary to the common good of the Church cannot have the force of law. (...)

• Because of all this, even though the rite, considered as such, were totally orthodox and a better expression of the doctrine of the episcopate, it would not be legitimate, because no pope has the authority to break the liturgical tradition of the Church. The invention of a new Rite is an act which is certainly illegitimate, even if he is a pope or an angel from heavenwho intends to establish it. (...)

• (...) And the Society is obligated to declare the illegitimacy of the Novus Ordo Missae, because of the doctrines of the Paschal Mystery that inspire it (...), so we must also recognize that the Novus Ordoepiscopal consecration is certainly illegitimate.

• The new rite is probably valid.A sacramental rite can be certainly illegitimate, but that does not necessarily invalidate it. (...)

• If we consider the matter, form and intention of the new rite of episcopal consecration in the context of the rite and the circuмstances of their institution, we think it is most likely valid (...)

• But we also believe that there is no certainty of its validity (...)

• Now, in a matter of utmost importance for the life of the Church, such as the validity of the episcopate, it is necessary to be absolutely certain. Therefore, to accept in good conscience this rite, it would be necessary to not only rely on the judgment of theologians, but on the infallible judgment of the Magisterium. As for the practical attitude to maintain in light of the new episcopal consecrations, it seems justified that which until now had been held by the Society: (Note the past tense, "had been held" NON POSSUMUS.) (...)

• (...) the positive and objective defects that this Rite suffers, which prevent having certainty of its validity, we feel that (...) they justify and necessitate the conditional ordination of priests consecrated by new bishops and, if necessary, the conditional consecration of these bishops. Such doubts in the very root of the sacraments cannot be tolerated." 

Are you absolutely certain of this Giovanni?
Can you provide any evidence or examples?
If you are aware of such doubtful priests it would be good to have a published list for the benefit of the faithful.