Ah, I see.
I wouldn't say API orchestration is the "new RPA", though. It's rather the "old BPM", and "current IPaaS". That is, we already have tools for API orchestration. It's nothing new. RPA is something different entirely.
And it's benefit isn't just for automating legacy systems. Automating the UI they're already familiar with is a much more intuitive experience for lots of people than going out of band to integrate with APIs.