This was my opinion. But anyone arguing to publish "results immediately" is likely to imply something like it. I guess in chemistry we have the situation you envision - for different reasons: Laboratories holding back their data, until their scientists have published their papers or developed their products. There is a real danger AI companies will do something similar too.
Who do you expect they will select for the exposition?
On which basis do you want a (likely US based) AI company to decide who is to untangle a proof that their latest internal model has just spit out?
Do you expect this to fall to an aspiring, but still unknown mathematician at - say - the mathematics department of Nairobi university?! This is what I meant with my rather unclear "elite" reference: The first publication will always show the name of a mathematician already known to the field, more likely than not to come from the same country as the company ("Our message ... is, you’re a great American company, but you’ve got to hire great American workers"). Are you not worried at all? Don't you think it would be good, if anyone in mathematics had a chance to write that first paper on a new proof?
Says who? The professional mathematician writing the article disagreed. Why should people start dancing the tune that openai wants to play for their own reasons and interests? And I do not see how taking the time and effort to write a proper exposition makes it "a very elitist science" when this exact effort and time is needed to actually get other experts understand and build on a result. Unless you equate spending time and effort learning math as "elitism", which is the ai-shilling moto some time now with everything time and effort related. I cannot see how spending time and effort to understand a field and then spend time and effort to make a proper exposition so that other people can also understand it as "elitist" vs throw everything out there "in raw form".