The title is confusing since FUSE is not a network filesystem. It can be used as a "frontend" for multiple different network filesystems (as used in sshfs and smbfuse). There is even a fuse-nfs project to allow you to run a NFS client using fuse.

But if you scroll down, the article lists a few specific network filesystems using FUSE that were tested (JuiceFS, goofys, etc...).

I don't follow all of the reasoning, but I am not surprised at the conclusion. The newer FUSE-based network filesystems are build for modern cloud purposes, so they are more specific for the task.