I don’t like the feeneyite position at all but… my gosh.. even if you think it’s objectively heresy (which I’m not claiming), how could you presume culpability with such high stakes when you don’t know?
Right. Even if it's your opinion that it's heretical, Father Cekada's survey of theologians had only a minority of them assigning it the note of heresy. So there's no clear consensus on the matter regardless. Those who hold the opinion don't believe it's heretical or even erroneous, and most would certainly abandon the position if the Church were to rule on it (vs. it being the opinion of a minority of theologians).
There's never been any anathema along the lines of: "If someone does not believe that desire for Baptism can suffice for salvation, let him be anathema." Father Feeney stated that his position was his opinion only.
There's nothing particularly clear-cut from the Magisterium about the matter, and the fact that Catholics who profess that they accept all the truths taught by the Church have different opinions about it is
prima facie evidence that it hasn't been defined. Otherwise, there would be no doubt, question, or disagreement, and all 27 of Father Cekada's theologians would have clearly stated that it's
de fide.