There is literally no reason that thread's title shouldn't be Monster Train! All aboard the vore express! It loses absolutely nothing. The original doesn't even follow your own logic. "Talking about Monster Train!" isn't a punchline, or part of the joke at all, it's the thread topic. "All aboard the vore express!" is its own joke and punchline.
I think I disagree here. The shock value of the first sentence, as well as the question it creates in the reader's mind ("What game is Jbear making a joke about?") seems invaluable to a skilled humorist. The question posed by the inverted title is "Why did you write a second sentence after the first one, I already know everything I need to know?" Putting the game first in this case not only elminiates the need for the joke, it also eliminates the opportunity for the reader to make the mental connection themselves and thus rob them of the satisfaction that understanding the humor brings.
Full disclosure: when I constructed jokes as a youth, I deeply valued the setup-punchline structure to which Jbear ascribes. As I age I find my appetite for melba toast waxing as my ability to live with creativity wanes. It's entirely possible I no longer know what is funny.