There are PLENTY of pre-V2 theologians who taught as Fr Feeney did, using the very strict explanation of Trent and water Baptism. But they were ignored and drowned out by the louder (and more advertised) modernist view.
Fr Wathen, in the first few chapters of his book “Who Shall Ascend?” quotes pages, upon pages, upon pages of 1700-1800s theologians who upheld the strict necessity of water.
And even IF there weren't any, Cekadism that holds that theologians are infallible is utterly absurd and has no basis in Catholic theology ... only in his own mind, and only when it's convenient. Somehow they ceased to be infallible at Vatican II when they unanimously supported Vatican II and the NOM (with the single exception of Guerard des Lauriers).
Popes are infallible every time they pass wind ... well, except for the 1955 Holy Week Rites ... which were Modernist, defective, and harmful.
Pay no attention, of course, when for 700 years every theologian taught the erroneous position of St. Augustine on fate of infants who die unbaptized.
It is impious and grave sin to reject the unanimous teaching of theologians ... well, except when, after 1500 years of absolute unanimity that explicit faith in and knowledge of Jesus Christ and the Holy Trinity are necessary for salvation, a few Jesuit (and one Franciscan) came along and rejected that 1500 years of unanimous teaching with their innovation of Rewarder God theory. That was OK for them to do, and, according to Father Cekada, they were right. And just ignore the fact that the Holy Office explicitly rejected Rewarder God theory. But when the "Holy Office" issued SH (most likely a fraud), darn it if you're not a heretic if you reject that.
Theologians are infallible when they want them to be, but not when they don't want them to be.