But you'll have to overcome and provide a good reason for why anyone using sqlite should move to your new unproven shiny.
If anything sqlite is a poster child for c done (and tested/validated) right. You'll have to demonstrate a lot more than you can implement some things better in the new language.
I interpreted that commentary as referencing a new library similar in architecture, like an implementation of S3 that lives locally in the software and is modeled after SQLite. Not “let’s rewrite SQLite” like everyone else seems to have run with.