Because only the experts in this field get to tell us, the laymen, what "solving the protein folding problem means", and they defined it not as "perfect" but as "more than good enough to be acceptable as correct result". Which this did.
X has actually solved Y. That's not so much "massively cool", that's historical.
I think the “they” you’re referring to is only whatever PR person wrote the headline. Nowhere in the substance of this (PR!) post does it refer to it as anything but a great leap. When an expert in the field outside of deepmind says protein folding has been solved, I’ll believe it.
X has actually solved Y. That's not so much "massively cool", that's historical.