While that wording is more precise, the current wording is better for promoting the software. Ordering by market share makes sense, and users who are quickly scanning the page for compatability information don't need to make the connection between OS X or Linux and *nix, and can instead recognize their current system easily.
If this were documentation the change should be made, but it's probably not the right move on a website focused on promotion.
If this were documentation the change should be made, but it's probably not the right move on a website focused on promotion.