Could go either way.
Easiest way to find out whether a scam is to do what you're doing. Ask for more pictures, vin and a picture with the plate with at least the state not edited out, they can keep numbers edited out.
If they keep giving you excuses of "I'm not local/I'm not available/I don't have any more pictures and can't get them" etc then more than likely a scam.
Escrow sounds slightly unorthodox.
Easy way is to find a local enthusiast (not necessarily a 7 owner) and pay them to scope the car out for you before flying out etc.
So far has all the checkmarks of a scam. Few pictures without confirming the state, he's magically unreachable in person, wants the money held by a third party etc.
Then again, high risk things = high reward, so if it's true it would be a good deal.
I flew out to see my car across the country and the previous owner was saying he can't get pictures because he doesn't know how to use a phone and needs somebody's help with it etc. A few other red flags too. All turned out to be real. Had a friend check it out beforehand.