The did, unless the lease expressly excluded use of the pool. A renter has more rights, not less, than a guest --- almost all of the owner, with the exception of transferring or significantly modifying the property.
Actually, that's not true. A homeowner does not have the right to override the rules set forth by the homeowner's association. If the rules of the association allow leasing of the condo and any number of 'guests', then fine, but I very much doubt that is the case.
A renter has more rights, not less, than a guest --- almost all of the owner
However, a renter cannot override the rules of a homeowners' association with governs the facilities such as pools, clubhouses, public spaces.