It says that "they are disposed to that justice". You need to be disposed to receive justification by the sacrament of baptism. Hearing does not transmit the faith, hearing disposes to be prepared to receive the faith.
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It seems to me that there are some who, to defend BoD as being
"de fide" or even
"ex cathedra" (seriously!), are coming from a place of ignorance regarding the nature of grace. They confuse actual grace with sanctifying grace, and I have met a few who claim there is no distinction, that all graces are the same; such that pagans ignorantly worshiping at a pagan shrine are thereby recipients of the same sanctifying grace (and therefore justification and salvation without need for Baptism) that the Apostles received on Pentecost Sunday.
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You can't make this stuff up!
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When did the Apostles teach that receiving the Holy Ghost on Pentecost made them all exempt from having to be baptized?