Yikes. What a gross, self-congratulatory rant. The author tries to defend against the term "gatekeeping" by getting out ahead of it, but that doesn't change how deeply exclusionary the result is.
It doesn't even stick to a specific complaint; it jumps around to different things that emotionally feel related in the author's mind but aren't actually. First we're talking about boot camps, then we're talking about how StackOverflow is "the scariest thing that happened to the programming community in the past 10 years", then we're talking about "diversity" speakers at conferences riling up "mobs" in some kind of conspiracy against the author and people like him?
Buried under all of this (literally, at the very end) is perhaps a poorly-executed attempt to tell beginners something of value, that it may not be easy now, but you can push through and it will get better. But I don't see any actual beginner reaching that part before getting discouraged by the rest into doubting whether they should be in this career field at all.