I read that one and agree it feels absurd. Not something I want to depend on.
The repo's readme is a bit misleading and it does make it look like a mad scientist experiment but you can read more about it here (really interesting stuff): https://jlongster.com/future-sql-web
Obviously this project is still young, but I find it convincing (disclaimer: I don't use it yet).
It is only a matter of time before browsers implement the proposed sandboxed virtual file system apis with block level access and this would be superseded.