Indeed, this change is not correct.

This land is not *natural* grassland, it’s cultivated, and so should be tagged as landuse=meadow meadow=agricultural. See https://wiki.openstreetmap.org/wiki/User:Gurglypipe/landuse

That tagging is different from how I tagged it 2 years ago because my understanding of grass culture has improved, and I think the tagging standards around farmland-vs-meadow have solidified in the general OSM community a bit.