The judge would have to order that his name be removed from the birth certificate if he was found not to be the biological father. But I'm sure the Gastons are not forthcoming as to how he was determined not be to be biological father. They wouldn't just take the word of the mother. I'd bet that DNA testing was done at some point & he was excluded.
The judge would have to order that his name be removed from the birth certificate if he was found not to be the biological father. Many men who AREN'T the biological father are listed on birth certificates who are never called into court to have their names removed by a judge. Once a child bonds with a parent, a judge can't make that go away with a stroke of a pen. It HAS obviously happened here, and is highly dubious as to its legality.