This claim doesn't make sense to me. I think game loading times are primarily limited by the hard drive. It's about loading data from there into RAM (and/or GPU RAM). The hard drive would be the bottleneck.
Optane is a brand that covers both the harddrive and RAM. For non-SSD HDDs it will provide a cache on commonly accessed files, providing a big boost to disk HDs and a minor boost to SSDs. Which is why I asked if people have noticed an improvement in practice with either the HD or RAM options, as I assume most people here have SSDs.
