Thanks for digging this up. Every "scientists create new storage medium" is always a disappointment when you get to see the write speeds. This seems decent? At least in "raw" numbers there's nothing obviously making this useless. Let's hope they have a path to quick commercialisation and make it available. If there's any DC adoption will be the real test, I think.
Write speed is probably the least important metric for people that are considering something like this. After everything with storage and longevity is taken care of, improving write speeds is a nice to have, but not the important part.