The southernmost redwoods aren’t actually in “southern redwood botanical area”

According to iNaturalist, the southernmost redwoods are actually located several miles south of “southern redwood botanical area“. If you look at the species map for redwoods in iNaturalist, you can see the observation. The redwoods are located on private property, so I guess we will never know for sure if they were planted or grow there naturally. The person who observed these redwoods on iNaturalist said “likely southernmost known naturally occurring redwood trees; spotted by drone flight due to inaccessibility from private landowner”. Please tell me if you have any more information on this!