I read it as he's not getting paid well enough to put money away so he's changing to a better paying job which let's him build up his savings and then move to teaching. Which would imply that PA isn't paying him very well.
Yes, he's not really clear that 'I am quitting so I can get a better-paying job to save up for becoming a teacher', but if you parse the paragraph carefully and pay attention to the 'but's, it's what he's saying:
> I am leaving because I have always wanted to teach. Doing so comfortably requires that before then, I need to put away a lot of money to support myself when I’m getting paid a truly ludicrous wage. It is true that I am paid below market value, but not so significantly as folks on the internet assume. I live quite comfortably on this salary, and while it’s less than I could make elsewhere, it’s not out of the bounds of reasonable expectation. But I want to accelerate my plans for teaching. So here we are. I love this company, but I have goals that won't be fulfilled by working there, so it's time to move on.
'I live comfortably... but I want to accelerate my plans for teaching'; he's not quitting to teach, he's quitting to 'accelerate my plans' ie. save up a bunch of money, which implies getting a better-paying job which is not itself teaching.
