The landlord sees it as two parking spots. The lease describes it as two parking spots. You would have to share with any other tenant who had a car. Your lack of interest in sharing is irrelevant.
Your rights come under the written lease. You have told us that you are able to fully exercise the parking rights granted to you under the lease. Your lack of interest in sharing the spot remains irrelevant.Quoting hadeion
Two spaces for tenants, with each tenant entitled to use one space (assuming it was not already taken by another tenant). If a second tenant obtains a car, that second tenant would have a valid objection to one of the spaces being used by a non-tenant.

