OK, the area around this course is now reverted and the LDPs etc. are complete again.  To see the old data, use https://overpass-turbo.eu/s/1yTD .  It seems that the main thing missing now are "hole" ways such as https://www.openstreetmap.org/way/1196053626 .  These can easily be undeleted or just remapped (there are only 18 of them!).
Any questions, please don't hesitate to ask!