I don't think it's a reworking of 9P.
It's closer to an older style of distributed file system, closer to
Amoeba's or the Cambridge Distributed System,
and using full-content storage operations on content accessed through a
separate and global name service.
9P (and relatives) allow a huge assortment of surprisingly different
service types to be represented and accessed in a uniform way,
where conventional file storage is easily the least interesting service.
(That isn't a criticism: both this and 9P-like things have their place.)