For example, the nav bar has "Niche category A", then in that it has 10 sub categories "Niche Sub Category A" "Niche Sub Category B" "Niceh Sub Category C" etc etc. In this scenario, the words "Niche Sub Category" are mentioned a lot
Because of this, each page has a random keyword mentioned over 500 times, a density of nearly 20%.
Now I know keyword density isn't a huge factor anymore, but I also know Google will penalize for keyword stuffing. Can Google tell that these keywords are part of the navigation menu and have nothing to do with the page in question? Or will they see a massive 20% keyword density for a keyword I am not even trying to rank for?