I think this plays into the give-and-take that good larping entails.
I love the “Joyful Chaos GM” comment and I’m certainly more aligned with that style myself!
Whether it’s a short form game or a longer campaign, the secrets, maguffins, plots and schemes all need to be revealed. It’s on the person holding that item to reveal it in characterful and cool way. With the shorter one off larps, either those secrets need to be more obvious in nature, or the person holding them needs to broadcast that fact.
Does that mean ham, or emphasis, or other? Depends on the person, the style of larp, the timing of the larp. I have had a great experience in a short form larp where the dropping entirely OOC to check something meant I was able to make plot happen in the right time frame for the whole game to enjoy. Definitely worth loss of immersion.
I think an adage told to me by the larpers I learned from applies: “If you have a larp secret, tell your best friend. And five other friends. Or strangers.”