And self selection - I think people who read hn are more likely to survive than those who'd don't (not because hn is special, but because those who read hn tend to have certain inclinations)
From my class of 25 only two are not in technology anymore. Probably 20 are employed as developers. The other three moved to ancillary tech roles (product management, sales engineer, etc...).
This is 2.5 years out. Part of the issue too is that "bootcamps" is too nebulous. Some are 7 months full-time, some are 6 week night classes. It's not always apples to apples.