It's not possible for someone who's not a specialist in the field to understand it (unless there are more elementary proofs, of which likely none exist).

siting on a recliner making an occasional sensible chuckle while flipping through the pages?

I totally disagree with you on the precept that all difficult to understand things need be needlessly dumbed-down/watered-down until palatable for a mass (average) audience. Requiring 'math50' before 'trig101' isn't gate-keeping in any moral sense, it's an effort to save everyones' time involved when the effort is futile.

Similarly I don't demand that haute couture fashion companies explain the style to me until 'I get it' ; I just take it for granted that i'm not going to be able to understand the entirety of the world in one lifetime.

Why? The investors can just ask Claude or Gemini whether the proof holds up.

OpenAI has that too - open their website and ask.