It would be my reaction if we're discussing a blog post from OpenAI, yes. I would be looking at it extremely critically, wondering what they're misrepresenting to make it look cheaper, easier, and why they're trying to make it look like only their model could possibly do this.
Look at their recent claims about their model "escaping" - there was literally a Guardian article calling them out for being hyperbolic! Again, it wasn't that they lied, their marketing department is too savvy for that. They just present it in way that's, well, marketing.
As for the actual result, I'll look for secondary posts by actual mathematicians and draw my conclusions there, not from this marketing blog post about results from a secret model.
Hmm. But this level of skepticism looks performative and seems to serve as a signalling thing rather than a functional thing. You do you though. If OpenAI solves the millenial problems, my skepticism will only be restricted to the correctness of proof. Not that it was "marketing" haha