The whole point of this discussion is that MongoDB, Inc could make that claim (as you agree)...and we as users of MongoDB will have to spend money fighting off that claim. You'd have to pretty naive to use software that has these terms.
It's obvious that several people disagree, but within this thread, conversing about this article, we should expect a bias to see things that way. I hope you'll stay open to being convinced otherwise. The SSPL has been submitted for review to the OSI, and this issue is one of the points of discussion that we're listening very closely to.