So my experience tells me that the clutch pilot bearing is somehow worn. In the Nismo series the pilot bearing can lose roller pins or they seize up if it dries out. Kind of odd as mileage is so low. It sounds like water got inside the bell housing. If car is off the ground and in neutral start the engine and see if rear wheels spin. If so then I would suspect the pilot bearing. Unfortunately this requires removal of the transmission and clutch to replace. Run this theory by another mechanic to see what he/she thinks. Hope that helps.
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