What does the south park episode 'your getting old' (season 15 ) mean?

so normal the episodes have a meaning behind them but does the episode show that south park is coming to a end becuae of like they are saying things u use to like seems **** when ur older and also wen his mum and dad argue is that like matt and trey expresing themselves of what they think so wat do u think they are trying to say about south park