The only other viable alternative would be to re-tag it clearly as "eco-region", e.g. by removing the "natural=desert" tag, and replacing it by a new, yet to be documented tag, of something like "natural=eco_region" / "eco_region=desert" (and where something like the Amazone Forest could be tagged like "natural=eco_region" / "eco_region=tropical_rainforest").

But I think for now is best to delete this node.