More than likely this is a “fly-in community” where you literally fly your private plane in and drive it right to your house. We stay in a community like this in Daytona Beach for the races. Huge houses with attached plane hangers for garages.
If this is the case, you can easily access the runway by simply driving on it. THe planes use the same roads as passenger cars. The security gates are at the entrances to the community but not at the air strip.