It's possible I missed it, but I didn't see where it said how they came up with this strain of yeast. I was kind of assuming they used CRISPR or some other kind of gene editing to make it.

Regardless of if it was edited or selective breeding and random mutation, I do share those same concerns about how fast it might mutate and lose its effectiveness.

As far as it mutating into something harmful, sure it's a possibility, but the same possibility technically exists with any strain of yeast out there in the world, untold millions of generations of yeast have lived, mutated, reproduced, and died in breweries, bakeries, and vineyards since humans first started brewing beer and baking bread, and it hasn't gone horribly wrong yet. It's certainly worth being cautious about, and I'm certainly no geneticist to make an educated statement about it, but I suspect it's probably a pretty low likelihood.