I'm curious and didn't see an answer to this question while reading that link (or the link to the original source) -- how does 'median tenure' distinguish betwe

I'm curious and didn't see an answer to this question while reading that link (or the link to the original source) -- how does 'median tenure' distinguish between a company where people are leaving quickly, and a company that is aggressively hiring/growing? A bunch of brand new employees drags down median tenure without necessarily being a sign of massive turnover.