The article says almost exactly the opposite, and I agree.

Your API should present all of the things it does as synchronous functions/methods. If callers want to run them asynchronously, they can easily provide their own goroutine to do so, including whatever lifecycle management makes sense for them.

The concrete example was

    // Do this
    func (t *type) Run(ctx context.Context) { ... }

    // Not this    
    func (t *type) Start()  { ... }
    func (t *type) Cancel() { ... }

This is generally good advice which stops a whole class of extremely common and very tricky to debug orchestration bugs outright.