I think their case is weak but it is something to continue to be considered when analyzing any new data. There’s weird soil chemistry there for sure, a good deal of which might be explicable from the interaction between perclorate and small amounts of organics, but the amount of data is tiny and I would not rule out soil microbes. A lot more work has to be done before you can say much with confidence.
Now I have!
I think their case is weak but it is something to continue to be considered when analyzing any new data. There’s weird soil chemistry there for sure, a good deal of which might be explicable from the interaction between perclorate and small amounts of organics, but the amount of data is tiny and I would not rule out soil microbes. A lot more work has to be done before you can say much with confidence.