Yes, in one of his talks, Fr. Hesse says: "...I have been ordained, unfortunately in the new rite of ordination, but thank God in Latin, everything strictly by the book and +ABL said that would be valid, +Fellay said it's valid and Fr. Franz Schmidberger who is my present superior in Austria says it's valid and +Williamson said there's no need for conditional ordination...."
I think overall that sedes believe it is certain that all NO ordinations are definitely invalid, but +ABL et al never held that line of thinking, only that there are many NO ordinations that truly are invalid.