Are retaining walls on slopes prohibited according to the development plan?

Whereas the planning status still seems to be far from the public display of the development plan.

I didn’t look properly this morning and read an outdated document. The development plan is currently in the public display phase, so you should quickly consider whether you still want to submit a comment. The height restrictions and terrain alteration limitations have been partially eased in the version on display. However, the inviolate status of the terrain at the neighboring boundaries remains unchanged. So you need to look very closely when selecting your preferred plot of land.