Serradinga kammanassiensis habitat

What habitat does Serradinga kammanassiensis live in? It lives only in the Kammanassie Mountains and Steve Woodhall’s book says it lives in grassland. However, these mountains are far from the southern limit of the grassland biome. Wikipedia gives no indication of isolated grasslands in the mountains. Metamorphosis website says they live in fynbos. Perhaps they mean grassy fynbos/renosterveld?

Any specialized knowledge would be appreciated.