As habi wrote there is nothing that can be done from the OpenStreetMap side as it is third-party data that causes the trouble.
This happens every now and then all over the world but disappears again after a while when the data is updated.
Some information can be found through this discussion:
https://community.openstreetmap.org/t/a-hill-over-the-sea-in-nuuk/124109
If you have a look on that position, this hill is gone by now.
As far as I can see CyclOSM uses NASAs SRTM https://wiki.openstreetmap.org/wiki/SRTM so when NASA publishes new data and CyclOSM update their map the crater will likely be gone.
Some other OSM maps (like Tracetrack Topo) use this data https://sonny.4lima.de/ which tends to have fewer issues like this one.