It is just an inference, for sure, but I reread the post, less angry, and imagining the author was a student I respected; It still comes off a bit crass, especially these two quotes:

"A less-talked about part of the bootcamper’s journey is what happens after you graduate — when you’re searching for that six-figure developer position."

"As I got more experience, I effectively “leveled up.” I became capable of completing interviews at companies with higher hiring bars. This is illustrated below as a linear correlation between the number of weeks I was into the process and the base salary I was offered."

At the same time, if I imagine the author as a (highly organized) co-worker, seeking a better salary, I have a bit more respect for the legwork he has put in (although it is highly unlikely anyone with a full time gig would have the time for it).

It remains unclear whether salary was the author's only reason to become a developer; there is only the absence of counterevidence. I would definitely feel uncomfortable hiring or working with a junior employee who attempts to "mask (their) inexperience", even during the hiring process.