That is probably a better fit, yes. Not perfect, since I was still intellectually stimulated by trying to improve the environment and processes, but every attempt inevitably hit a roadblock. I identify most with the 2nd and 3rd categories in [1]

However I think it's more valuable for me to keep using the term burnout, especially in situations like this. To a manager, burnout and boreout look the same. Ideally you could inject 'boreout' into the public consciousness, but it's more realistic for me to say I was experiencing burnout with different root causes.

[1] https://www.inc.com/melody-wilding/3-types-of-burnout-accord...

In this case, I think you wanted more opportunities and career growth and that wasn't possible in that role. I've been there before. I don't think this is burnout, you just outgrew your role, and there was no reason to stick around.