Turns out that what this guy does is buy junkers floating in the marina and turns them on Craig's list. Explains why he could not answer any questions about the boat. He never sailed it. Only had it for six months. Rigging was shot. In fact, the pictures he posted on CL were not even his. They apparently were from the previous owner's failed attempt to sell this tub. Who knows how old those were?! This guy couldn't figure anything out because he knows nothing about the boat.
Or you do the the survey he incapable of. To heck with how they sail, research will tell you that. Thru halls, Stuffing box tubing, stuff that will make it sink, then go from there. Reduce price accordingly. If he doesn't have the education , educate him, but only on the bad.