Yep. 99% of any buyers who actually are interested in your car from looking at an ad, will call you in person, come look at the car in person, agree on payment method to suit you, and pick up the car in person. Text past the first contact, agreeing to price without personal inspection, sending extra money for you to pay shipper, using as shipper at all, physical disabilities, is overseas or works offshore, feels to good to be true, it is always a scam.
He is getting the money you are going to send to a supposed shipper that does not exist and then the check he sent you comes back no good a few weeks later. Be glad you questioned it.