This is clearly bullshit. It's not even the "hmm maybe" kind of bullshit – just the straight-up, inarguable, obvious kind of bullshit. The company pitching this particular bullshit (<a href="https://www.exlterra.com" rel="nofollow">https://www.exlterra.com</a>) also pitches the same bullshit for making trees grow magically faster. It's a modern dowsing rod and anybody associated with this obvious scam should be ashamed of themselves.
This is a seemingly interesting technology, but I'm unable to evaluate how this works and if it's actually a practical, sustainable way to deal with radiation, or just a PR effort. Any HNers who can confirm and or/explain the significance of this?