Furthermore, hundreds of people have been responsible for its development over the years: https://www.postgresql.org/community/contributors/
As an additional, possibly more relevant example - the Cortex project has 158 contributors: https://github.com/cortexproject/cortex
My larger point is that, in contrast with the new project, InfluxDB currently has ~400 contributors. I'm certain that many dozens of those were involved in getting the current storage engine to a stable place. And now that hard work is on a path to being deprecated by moving to a completely new language and set of underlying technologies.
Taking the project from a handful of contributors to a production-ready technology within an existing ecosystem is a non-trivial task. I'm sure it will come together eventually, but the commitment to ship it "early next year" seems unlikely to me.