[Moissanite]

Seems like we live inside a self-cleaning oven.

I only read the abstract and conclusions so maybe this is covered in the paper - but based on some reasonable estimates of the damage done to organic matter by these x-ray bursts (and similar events) and of the time taken for life to evolve, I assume we could significantly improve on the Drake equation by updating terms which represent "probability of not being scoured from existence".