About the "85% of infected people say they wear a mask" thing:
Given that most people wear masks routinely in public now, this is not surprising. Masks that we are wearing out and about are not perfect (or even particularly good) protection for healthy people; they are intended to reduce the spread from sick people outward. They are far from perfect at stopping spread but much better than nothing. And there are a lot of ways a healthy person can get infected such as through the eyes and so on.
What's more important would be a comparison of "how many people are getting sick each day versus how many more would be getting sick if we as a population were not wearing masks." While obviously we don't have a maskless control half of the country to compare with the other, masked half, it's pretty clear that masks are reducing the spread dramatically by several fold. This has been explored previously with various references; we'd be having several times the deaths per day we are seeing if nobody was wearing masks.
Even as it is, the recent "let's open up the country in time for the election" push that has been going on is having a pretty severe effect, particularly as combined with more people being indoors as the weather cools. It's going to be a rough winter.