Yes, that's true. Many people, including scientists, don't actually understand how the scientific method works.
However, there is also another possibility, and that is that the word "knowledge" is being used in two different ways. "Knowledge" in science is often used as a shorthand for "The best explanation we currently have in hand, one which has so far withstood all attempts to falsify it." This is different from the kind of knowledge studied by epistemology, but it is a not-entirely-unreasonable use of the word.
However, there is also another possibility, and that is that the word "knowledge" is being used in two different ways. "Knowledge" in science is often used as a shorthand for "The best explanation we currently have in hand, one which has so far withstood all attempts to falsify it." This is different from the kind of knowledge studied by epistemology, but it is a not-entirely-unreasonable use of the word.