Hello, Andy from the DWG here.
Various “poor quality for pay” mappers have been active on and off in the USA for many years.
One of a group that has been flagged this way has recently woken up again with a “very large building”. I’ve commented on the changeset, and they’ve now changed it to a “park”.
This group’s previous activities were mainly retail - they tended to delete and re-add shops in malls numerous times, sometimes with old or unveifiable names. If anyone sees anything like this please email data@openstreetmap.org with a subject line of “[Ticket#2021110310000086] community reports” .