JFC. NO. THIS DOES NOT MEAN THIS COULD ROOT 90 PERCENT OF ALL DEVICES. The wording here is important. "Almost 90 percent of Android devices run on affected versions." That lets you have big, scary target population without any actual data.
The apps have been pulled. Even if all 850,000 devices noted here were exploited (and there's zero data to show that's the case), that's one-one-thousandth (at the high end) of the total population.