All of his edits (at the time of this writing) seems to span through 2/3 of Khon Kaen province, with few edits crossing over the province boundary:

It took me very long to reach the bottom of the edit stream. (Pascal Neis’ Your OSM Heat Map with Mapnik basemap seems to fail me for a while now, so I used the main OSM edit history tool instead)

Some sampling reveals that a small (very small) fraction of his edit came with plausible tag and/or place name; so this should be taken into consideration too when a mass-revert takes place.

For the main issue, I’m willing to wait 3 days for the mapper’s response, counting from the timestamp of my changeset discussion comment (posted 2018-12-08 12:29:21 +0700), before notifying DWG; which I already drafted an email for that.