boundaries for Korolyov do exist in OpenStreetmaps: https://www.openstreetmap.org/relation/184109. so you could get those boundaries in KML format via the Overpass API. see https://forum.inaturalist.org/t/how-to-create-new-places-with-the-help-of-openstreetmap/6701/5. using either of the scripts noted in that post and replacing the relation ID to the ID for Korolyov (184109), i was able to export a KML file that i was able to load into QGIS:
i think think the removal of the web place editor is actually intended to prevent the creation of these very roughly drawn places. it was really hard to use that tool to draw a place with very complex boundaries. so you ended up with people using the tool to draw places with very simplified boundaries. i think you’re saying that the Korolev place with very rough boundaries was “created automatically”, but it is actually community created, and i would bet that it was probably created by someone using the web place editor.
that said, i don’t think anyone is necessarily against cleaning up those roughly drawn places, and i don’t think removing a key source of these roughly drawn places goes against that goal.