It's an entirely new project that happens to have some compatibility with one of the popular SQL databases, namely SQLite.
>Our goal is to build a reimplementation of SQLite from scratch, fully compatible at the language and file format level, with the same or higher reliability SQLite is known for, but with full memory safety and on a new, modern architecture.
And they call it rewrite in a recent followup post[1].
[0]: https://turso.tech/blog/introducing-limbo-a-complete-rewrite...
[1]: https://turso.tech/blog/we-will-rewrite-sqlite-and-we-are-go...
Turso a third party project that has nothing to do with SQLite.
SQLite compatibility at file level is a nice perk which I am not totally convinced is truly needed at all. Like, it's hard to imagine scenarios where this is useful. But it can be.
Anyway, godspeed. Just don't steal valor.