I'm pregnant with my first and have been reading various books on hypnobirthing, including the one from the Positive Birth Company.
I'm a bit surprised that some people come away feeling that hypnobirthing is only for unmedicated births in a birthing pool. I mean, yes, the author is clearly in favour of this method of giving birth; however, to me the book makes clear that births do not always go to plan. In fact, the book actively encourages women to think about what they would like to happen if things don't go to plan: how do you want your birth to look if you need to be induced? What do you want to happen if you need an unplanned C-section? There's a whole section on how to set out your birth preferences in the event of various scenarios.
She also talks about how you need to consider your options and think about what is right for you in your circumstances. That may well be an induction. In other cases it won't be. For example, I know someone who was still pushed into having an induction that had been scheduled, even though early labour had already started that same day. She regrets not refusing the induction and letting nature take its course. Having an induction purely because you're already booked in the hospital diary is not a good reason to have one.
Someone else I know practised hypnobirthing and ended up with a 4-day labour, culminating in an unplanned C-section. However, she still found hypnobirthing worthwhile and was able to have a relaxed birth in spite of that.
I don't know what the online courses are like, and I suppose it depends on the tutor. However, I don't think the books pretend that hypnobirthing will automatically lead to a perfect birth. They seem to be more about giving you tools to have a positive birth experience, whatever the circumstances.