It seems clear that "humility" here is being used to mean something like "self-deprecation". I have seen the word used in other ways

Yeah. I would like to have some textbook on social skills, where one chapter would be e.g. about humility: many possible interpretations of the word; which ones are helpful, and which ones are harmful, and how it depends on context. Specific, specific, specific.

EDIT: What I mean by this is that people sometimes give you an advice that "it is better to be humble", but without the details about how specifically to be humble (and how specifically not to be humble), such advice can be even harmful. Also, the advice from other people usually comes with its own bias, namely that people are more likely to correct you on behavior that somehow harms or annoys them, but will be quiet about behavior that only harms you.