One thing you do on a pool deck is sunbathing
https://wiki.openstreetmap.org/wiki/Tag%3Aleisure%3Dsunbathing
https://taginfo.openstreetmap.org/tags/leisure=sunbathing#overview
and many have a table, chairs and umbrella there so outdoor seating, private would show up on the map, The Private no different as the access=private on the pool
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