You are not the only suspicious one. 3 1/2 months sailing the Pacific along the coast of CA, Mexico and Central America, and no other vessel comes in contact with him? I just have a feeling that shortly we will be reading that his story is a hoax.
I sailed these waters from Panama to Hawaii. The first half (2500 miles) is roughly parallel to Central America, slowly diverging away from Mexico.
Trust me, you can spend weeks out there and not see a soul. Water is the main issue, on my trip (solo) during the 1999 "Great El Nino" there was not enough rain to fill a thimbal, and someone adrift would have died of thirst.