Getting the posts out of the forum is a bit tricky, the Discourse software this forum runs on has an API, but I’m not sure it’s public.
If you have all the words, there’s definitely clever things you can do to form real sounding phrases. Markov Chains are a good place to start. I don’t have a link to share. I’ve seen a fair share of Markov bots that say close-to-real-sounding gibberish.
If you do word counts, pull out common words and then use natural language libraries to pull the syllables, that could be a way to create lyrics with a cadence. It’s a potentially deep topic, “Conversational AI” is a bit of a buzzword thing lately. Definitely worth messing around with!