I think the implication is more that these can form in the absence of life. We'd need a lot of space rocks to get just traces. But if they can form spontaneously there, they could form from conditions on earth, too. And that's more likely to get things started from very simple beginnings.
No and it’s not that crazy surprising either. We know that these things can form in prebiotic atmosphere under influence of things like UV and specific rocks en.m.wikipedia.org/wiki/Miller–Urey_experiment
now it’s just confirmation that these things can be found not only on planets but also on asteroids
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