PlanetScale for Postgres

Does this new PostgreSQL offering share any heritage with Vitess or is this an entirely new piece of technology, or based on other components that PlanetScale have written since the Vitess days that aren't direct descendants?

Update: to answer my own question https://planetscale.com/blog/planetscale-for-postgres#vitess...

> Vitess’ achievements are enabled by leveraging MySQL’s strengths and engineering around its weaknesses. To achieve Vitess’ power for Postgres we are architecting from first principles. We are well under way with building this new system and will be releasing more information and early access as we progress.