freebeer
For the record, my first comment was based on a Potlatch 1 search for deleted ways, as I did not know where to expect to find the park outline.
The false positives are probably due to the relation, that Potlatch 1 may not properly support.  I know that the present new-style multipolygon support had to be added to Potlatch 2.
Potlatch 1 allows me to visualise multiple deleted items when a particular changeset is not known, as well as offering a simple way for me to see the different revisions.  It's another tool, and I'm sure somewhere is a better one.
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I'm trying to understand how Phoen19's changeset that disconnected and deleted the members got so twisted, and whether a pulled node for which iD is known, was involved.
I'm giving meself a bit of time to study things.  And retrieve a kezboard or five from storage in my pigsty.  I hope you're in no rush, I want to do a better job here than so far.