Flooring fitter here and have taken up gazzillions of the so called Vynil Asbestos tiles in the years before we even knew it was not good for you so probably I am walking dead by now .
if you are putting new stuff like Amtico or Karndean down then the old tiles need to come up , just screeding over them is not good as the floor is only as strong as its weakest link which is the old tile to black bitumin adhesive so when it goes wrong you will still have the problem .
Get rid of them now is the best advise . they are very low level risk if you follow the rules .