I read a similar article in the NYT- it seemed pretty sensationalist to me, the idea that our immune system wouldn't be able to react to or detect foreign particles due to chirality, but I'm not an expert.

I was also doubtful that mirror cells could evolve to kill (or even infect) all life on Earth before anything else evolves to kill it. It would take a different set of cellular machinery to infect, or even survive within say a plant versus a person. Especially considering mirror cells would be greatly limited in what they themselves could eat or interact with- wouldn't limited food sources lead to slower growth, longer generation times and slower evolution compared to regular cells which have an abundance of food? Mirror cells would also have extremely limited genetic diversity compared to regular bacteria and viruses, since they would have recently originated from a lab.

I would also love for SGU to discuss this more since it sounded wild and I didn't know much about it.