If you have checked his reputation then have some faith. Perhaps the point charts specify a building or view so - he knows what he is booking for you? It does not matter that the owner has never been to your resort. You told him what you wanted, and I am sure he will deliver otherwise he would not have commented.
Many VIP owners add the guest name at the 60 day mark because to add the name of a guest has a cost involved or the owner does not want to use up their yearly guest confirmation add ons until a later date - in case if there are problems, cancellation, or other circumstances.
Your contract is your payment and his acceptance of payment and things agreed to.
However, use your instinct - if you do not feel comfortable with the seller, it is better to back out now - so he can book something for someone else.
When I have rented from owners in the past before I became a timeshare owner, I would book closer to the travel date - if there were any problems I could file a claim with my credit card. I have never had to do this. Everything that was promised was always delivered and then some!
Good luck with your decision!
Cynthia T.