Any training company making those kinds of claims is talking absolute nonsense. You'll be very lucky if you're earning 15K p/m as a junior fresh out of any college, let alone university. If you're entering into a coding academy the assumption is that you don't really know anything about coding going in.
Trust me, you'll know barely much more after coming out. You'll have TONS to learn. Maybe you'll better understand some fundamentals which will help set you up for the future, but no chance are you going to be an effective developer if you've never done it before without at least 2 years of prior experience.
If you want to code, and want to learn coding, and you have access to a PC and the Internet, then just learn to do it yourself, don't go to these coding bootcamps, they won't teach you anything you can't teach yourself with a bit of initiative and effort, and the more you teach and push yourself the more you'll learn. The vast majority of highly effective engineers I've met in my career were self taught prior to ever doing any studies.