How suggestive is this of life elsewhere in the universe?

On it's own, probably not that much. We know that amino acids can form in interstellar space and have in fact observed clouds of them in star-forming regions[1]. Finding them on a non-planetary object in our own solar system is certainly very cool but we already knew they existed in this neck of the woods. ;-)

1: https://www.space.com/amino-acid-tryptophan-perseus-molecula...