Have you confirmed that people actually end up working for that sort of money after a 12 week bootcamp? From what I have heard few companies will pay that much for somebody with only having completed some bootcamp and having minimal track record. It could all be just marketing spin.
Typically if you want to switch into a new field, then not only would you need to learn the applicable technologies, but also get some experience. For example, it is rare that you could pivot your medical device experience to data science and machine learning and keep earning at least the same or more.