Which is why it's far from a sure thing, only a possibility. However, if an object impacts Europa directly from a heliocentric orbit it won't spend much time in Jupiter's radiation belts. With enough luck maybe it would hit just the right patch of Europa to be captured in the ice and make its way down into the ocean without much exposure to radiation. Certainly that's a very unlikely event, as is simply getting a rock containing life from Earth to Europa in the first place. However, the Solar System is very, very old and in such stretches of time unlikely events can and do happen.
Ultimately the possibility cannot be conclusively ruled out, and given the implications it's worth considering.
The GP was about life from the ocean surviving the geyser into space, as "long string of frozen droplets that could contain organisms" in orbit around Jupiter.
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Which is why it's far from a sure thing, only a possibility. However, if an object impacts Europa directly from a heliocentric orbit it won't spend much time in Jupiter's radiation belts. With enough luck maybe it would hit just the right patch of Europa to be captured in the ice and make its way down into the ocean without much exposure to radiation. Certainly that's a very unlikely event, as is simply getting a rock containing life from Earth to Europa in the first place. However, the Solar System is very, very old and in such stretches of time unlikely events can and do happen.
Ultimately the possibility cannot be conclusively ruled out, and given the implications it's worth considering.
The GP was about life from the ocean surviving the geyser into space, as "long string of frozen droplets that could contain organisms" in orbit around Jupiter.