Yes, but Lienart ordained +Lefebvre to the priesthood on his own, and if +Lefebvre wasn't a valid priest, it's doubtful that he could be validly consecrated a bishop.
Nevertheless, there's no doubt whatsoever about his validity.
Matter, form, and intent are all that are needed.
As long as the matter and form are done correctly, the Church assumes proper intent on both the bishop and ordinand unless one or the other makes a clear pronouncement otherwise.