A large reinsurer has to evaluate trends in weather and the associated risks of e.g. storm damage, as for them every percentage point is meaningful.

However, you can treat them as an information source about risk - if there would be a significant increase in likelihood of extreme weather, then you'd see it reflected in the insurance rates, and if not - well, they have done the homework and are betting literal billions that the worry is just an exaggeration for now. If the insurance rates aren't doubling, then the risks haven't doubled for sure.

Apparently they've been doing it for "more than 40 years." I'm guessing it's part of the general business of being an insurance company.