For completeness, we know about this and have been discussing it internally. I’m not the DWG person dealing with it, but my impression is that a fuller revert than has currently happened will be required, but that will need a bit of careful planning.
From a personal point of view it’d be great to have thoughts on how we can catch situations like this where someone has been many good-faith changes that actually weren’t valid partly because the editor they were using was a bit “economical with the truth”. This mapper was clearly trying to improve OSM; it’s a real shame that they were misled into making the edits that they made.