Precision matters, but you're just nitpicking based on your interpretation of "fit". I guess you're thinking of it as whether the candidate is "fit" for the position. My use of it was referring to whether it was a fit for what they're looking for (where money is obviously an important factor).

Simple solution. Set up an Ask HN: What does job not being a good fit mean to you. See how many people say it relates to cultural fit vs pay.