They (probably) are, in that I submitted the URL to them when I originally applied 13+ years ago and it's been used by different parts of the company for various corporate purposes over the years (board/VC decks, recruiting, depositions, etc).

Which angle are you concerned about: that I have a resume live on the internet, or that the contents are what they are(, or something else)?

As an employer, I would never worry about an employee having a resume out there (or being on LinkedIn/theLadders/other), nor do I care what content they put on the web that isn't company-proprietary. If a company thinks they want to control such things, they probably ought to find better things to concentrate on, IMO.