Here's a great article on the progression of St. Augustine's thinking on this issue --

https://catholicism.org/baptism-of-desire-its-origin-and-abandonment-in-the-thought-of-saint-augustine.html

Anyone who's interested in the real truth about the matter needs to read this.

BoDers hold up Augustine and Ambrose as the two champions of BoD among the Fathers.  They neglect to tell you that 1) several Fathers explicitly rejected Baptism of Desire and 2) that what St. Augustine floated as a speculative opinion in his early days as a Catholic he later came to violently reject after he matured theologically.  So that leaves St. Ambrose.  BoDers derive his support for BoD from the oration to Valentinian, but the meaning and context of what he was saying is entirely ambiguous.  At another point, St. Ambrose too explicitly rejected Baptism of Desire.

So, despite all this, that there's very little support for it among the Fathers, the Cushingites lie that there was unanimous consensus among the Church Fathers in support of BoD.  If anything, the opposite is true.