If they are willing to pull their product for 0.1% of customers they will probably announce a refund, give it a week .
"Our tests all came back negative for food pathogens, toxins or outside contamination,” so it's possible that it affects just a few people but they're still be being careful.
And frankly in this case refunds are implied, I would imagine that they would be sued into oblivion otherwise.
I just think it's good to see a company take things seriously and act rather than engage in PR. E.g. Theranos, Samsung etc.
They'll give you a refund for basically any reason. Just email them and say "I don't like it" and they'll give you a refund. You don't even have to ship it back.
That's always been the refund policy, by the way, it's not related to this incident.