I think that this would be a better link as it actually explains what Metaflow is without too much marketing fluff https://docs.metaflow.org/introduction/what-is-metaflow

It seems like a half-remebered clone of facebook's flow: https://docs.metaflow.org/metaflow/basics

The plus side is that its not obviously async which is nice, the downside is that the syntax is less fun (you need to explicitly link forwards, rather than backwards.)