Hi. I have this issue too, with a major bump in the runway. Tried deleting the content of the asobo folder, but it just gets replaced during start-up of the game.
I cannot find a file called content.xml. There are many files called *content*.xml though. I am using Steam and the GOTY version of MSFS 2020, with the latest updates.
Anyone able to point me in the right direction for the exact file I need to update?
Thank you (great scenery by the way!)