It seems to be wrapping drizzle, with astrodb just being a way to deeper integrate it into the framework and adding some ease of use features. Also seems like a nice way to support the development of astro by using their hosting service.

As far as I can see from looking at their repo, Drizzle isn't a wrapper for Kysely though? You can use Kysely or other query builders with drizzle, but it has its own query builder too.