You see, what’s post-ironically humorous about the statement “it’s funny because it’s true,” is that what it is presumed to ironically say is that “it’s funny because the SUBTEXT is true.” However, it is not worded this way, and therefore is not saying this. What the statement is REALLY saying is, “It’s funny because it’s NOT true, but has a true subtext, therefore making it ACTUALLY true.” This ascension into post-irony makes the phrase “it’s funny because it’s true” a joke in and of itself. So yes, “it’s funny because it’s true” is post-ironically true.