In the article they said that that is what was expected but the gains impacted the entire ramdrive and the concept has been proven now. The test used a 500mb+ block so bigger than the cache alone.
https://www.tomshardware.com/news/amd-3d-v-cache-ram-disk-182-gbs-12x-faster-pcie-5-ssd
Maybe, but it’s a lot faster than what we can do right now and its only the start.