Well, you're right, but keep in mind that breaking textbook RSA is not exactly "the frontiers of human knowledge", theory-wise. Most textbooks, in fact, will warn you that their description of RSA is vulnerable to chosen-plaintext attacks, and therefore you should add a padding scheme for your messages.
However, papers like this are extremely useful, as they show new ways to exploit this theoretical vulnerability in a real-world case study.
However, papers like this are extremely useful, as they show new ways to exploit this theoretical vulnerability in a real-world case study.