The Ensemble doc mentions Studio and Atelier to create customer business process logic, but does not mention VS code.
The official InterSystems message is that Atelier is deprecated and putting it front and center in the interoperability doc seems like a mistake.
Maybe Studio means old Studio and VS Studio, but if so some clarification would help.
Elsewhere in the doc, it says only Atelier can create custom business logic. This ls probably a mistake.