Yes, but....the usage you apparently objected to is how the word theory is used in the world, i.e. it's one of the meanings of the word. At least, I looked in a

Yes, but....the usage you apparently objected to is how the word theory is used in the world, i.e. it's one of the meanings of the word. At least, I looked in a couple of dictionaries and they gave sentences just like the one you objected to, as examples of correct usage. Yes, in science, the word has a narrower meaning; I'm sure people on here know that.