This is a state crime, not federal, so he can’t pardon himself as president. I think he could if he was governor of New York, which seems like a long shot.
And New York’s AG has seemed pretty keen on seizing his property if he wouldn’t pay before. Idk if they can do that for these types of fines but I’m sure they will if they can.
Deafness is commonly understood to include both total and partial hearing loss. Every major dictionary defines it this way. It might have a more precise meaning in some spheres (medical, etc), but in common English it is not binary the way you’re suggesting.
Merriam Webster: deaf
Dictionary.com: deaf
Cambridge English dictionary: deaf