That is definately not true. He may be deemed elected as VP, or the DNC may be found to have failed to field a legitimate candidate, in which case Biden who was chosen by Hussein, is also inelligible, but a president will still have to be chosen by the electors, from the field of candidates.
OR.....
If the 1st place EV winner is ineligible, does it fall to the second place finisher?
OR
If we want to go with the Constitution...if Obie is invalid, then no one recieved a majority of the EVs and the election goes to the House-of-fools.
my guess, Obie produces proof of birth/citizenship or the SCOTUS punts.