Rather than deleting features which exist and are visible on aerial imagery, it is far better to add appropriate access tagging to indicate that they are private. If a feature is deleted, it is likely to be re-added later, without the access tags.

You may find this page in the wiki useful, as it addresses a similar issue.
https://wiki.openstreetmap.org/wiki/Why_we_won%27t_delete_roads_on_private_property

I have restored the parking area and added appropriate tags in https://www.openstreetmap.org/changeset/152875149