@knight_evangel Youm was obviously talking about Myuran, not Rimuru. Even if you completely forgot about how Youm and Myuran became a couple back in Chapter 61, Myuran herself is on the very same page as when Youm made the statement you are referring to. And in two panels at that, one where she blushes in embarrassment and one where she even calls Youm a "Fool..." (as in "baka...")
@Mckinley12 None, because the main canon, which the manga is a part of, starts to deviate from the WN continuity here. In the WN this "fake news" idea wasn't brought up. In the LN however, this is still part-way into volume 6, chapter 1, if I recall correctly.