Not that many I suppose. But I think we are taking different approaches to this. Here is one way to look at this: imagine we are actually trying to commit suicide by triggering that mechanism. How can we be most effective?

I think the Finnish have proven with a very large data set that getting your body/core overheated and immediately jumping into a freezing lake (literally), is not going to be a very effective suicide method.

On the other hand, knowing that the brain makes use of the heart to deliver the fatal blow, we would want to make our heart as STRONG as possible before our suicide attempt, so the brain can most effectively do its job. Considering how strong our endurance athletes' hearts are, it would not be surprising to find pulmonary edema after the fact.

Think the brain takes over and from then on it is its job to kill the body. Whatever triggers that in the brain is what one would want to do in such a suicide attempt. And I'm arguing that Finnish sauna/freezing bath, habitual or not, cannot be an effective way to trigger it. That's because I believe the Finish would have found evidence of that by now.