Very obvious fake science. I 100% guarantee you that if you take an unbiased look at the data, all the variance will be explained by something like age or occupation selection bias.

As the article says, ambulance drivers die on average at 64.

Even the idea is absurd. "Occupation" is already an extremely vague category which heavily confounds numerous very obvious risk factors. The best statistical methods won't help you make a crisp signal out of pure noise.

It also ridiculous how they just handwave that the hypothesis fails for other occupations.