The update is only short if L&P followed through on his initial comment from the start of the process for this event, but if he changed his mind during the middle, like with the Aiden event in v0.130, then he probably turned this one into a major plot event as well based on what you're speculating it to be. It's almost like he doesn't know his own story and which events will be considered major plot events until he starts to design it. Whatever it could be, He is deadset that it needs to be in this update which is most likely tied in with his helper and I would expect the render count to be high as well.
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Here's a comment he made back on 3.25.21 about going to event-based releases and depending on how enormous the events are going to be.
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If the story is planned out, one would think that he should already know where the key or major plot points are going to be in his novel, which he should know will be bigger than your "average" update. Also, it makes me wonder if he is concerned or second-guessing himself about event base release and if it was a good idea to do it now based on this comment made back in March.
All we know right now is everything he said in his post isn't working out.
- Updates will be released from now on after any main event is finished. Which means they will be smaller of course but come out quicker.