Ola Knutsson Nos - Fathered Knut at 12, married at 14?

I understand there is a baptism record for a Ole Knutsen on Feb 19th, 1786 - https://media.digitalarkivet.no/en/view/8545/66 - what I want to confirm is how we know this is the correct Ole Knutsen

I also have some trees saying he was born in Foss, Sigdal, to other parents, but that also doesn't line up with dates (born a decade before those parents were married, if 1801 census bd of 1771 is to be believed)