Unless you have a special revelation from God you really don't know that. Some Jєωs are invincibly ignorant of the Gospel. There could be some who died with a desire of becoming Catholic and who would have had they if given the opportunity. One day you could be sitting in Purgatory saying to yourself, "Oh if only someone would pray for me."
You talk like a serpent. Pope Eugene IV and the Council of Florence infallibly defined no Jєω has salvation. Desire is needed for water baptism to be valid, whether by the adult receiving water Baptism or the Godparent of the infant being water Baptized, and that is defined by the Council of Trent, not merely the Catechism. This desire is the only desire that exists which is necessary for valid water Baptisms, which is the only Baptism that exists. The original text and English translation, Canons and Decrees of the Council of Trent, by Fr. H. J. Schroeder, O.P. is the actual Council of Trent's written decrees and records. It explains:
"Baptism of desire" takes effect at the pouring of the water - at the sacrament itself.
Priest: "N., do you wish to be baptized?"
N.: "I do"
(or the Godparents for an infant)
- the catechumen has to indicate the will or wish to be baptized, then the sacrament's form and matter follow.