Later on in the book, he says:
"Baptism is necessary for salvation by a necessity of both means and precept for adults, who are not yet baptized.
Unbaptized infants who die go to Limbo. Notice, they do not go to Hell. Also notice, they do not go to Heaven.
Unbaptized adults who die go to Hell. Notice they do not go either to Limbo or to Heaven."
And
"There is only one Baptism. And every baptized baby is a subject of our Holy Father the Pope. (When you go to Heaven, most of the Americans you meet will be under seven years of age!)"
He probably states this because the Balt Catechism states that unbaptized persons
without actual sin go to Limbo. It's rare that an unbaptized adult would die without actual sin.
Having said that the BC also states that it is "common opinion" that they go to Limbo, but that is all. Father Feeney had a different opinion.