The priest in question may THINK he is belonging to the Catholic church, so he is not personally schismatic. He intends to belong to the Catholic Church. Objectively, however, the main deficiency is that the New Rite FAILS ABYSMALLY to attain its end.
AS Pope Leo XIII said, a Sacrament must effect what it signifies, and signify what it effects. THe Rite of ordaining a Newchurch Bishop is NOT sacramental: For the prayers do not clearly convey the role of the episcopacy; to Rule, To Sanctify, TO Govern, and to make priests.
In Fact Novus Ordo Apologists say the Form borrowed from the Eastern Form. FALSE.
The form is a bastardization of an INSTALLATION ceremony of a Maronite Patriarch...
...uh, aren't Patriarchs already Bishops?
*Denied!*
Therefore, since there is an error in form, and the rite is essentially the ordination of a whole new kind of priesthood, it would be giving approbation to schism to attend; for who could not Contend that the Novus Ordo Church as a whole was Schismatic from the Catholic Church?
That's what Abp. Lefebvre taught.