He has to deal with these tickets. It is possible his car can get impounded. He should check into homeless court.
Andrew Roberts (818) 597-0633/ (805) 496-7777
He has to go deal with the ticket directly. He also needs to find places to park where he knows he won't be ticketed. If he doesn't he'll get his registration suspended and his car can get towed, etc. It's a common situation that will worsen his situation.
If he can prove that the vehicle is disabled - i.e. flat tire or other excuse then he can attempt submitting this proof to the parking bureau that issued the ticket and seed that the ticket be excused based on the argument that he could not move the vehicle. Otherwise he needs to not park illegally.
The above answer is for general information only and is based on the information you posted. Every case is fact dependent, so to get a thorough analysis of your situation, you will need to consult face to face with an attorney licensed to practice in the jurisdiction where the incident took place. Do not conclusively rely on any information posted online when deciding what to do about your case.