You're correct that the absence of a sufficient condition does not prove the absence of a necessary condition, SGD2021, but the "common sense" statement in our explanation isn't based on a sufficient condition not occurring. It's a contrapositive! It's based on this unstated relationship:
Advances in Genetic Research
Genetic Research
(If there are any advances in genetic research, then there must have been some genetic research)
It was unstated because it was self-evident, but when we say it aloud using conditional terms you can see that the commonsense statement in the explanation is logically valid.
Adam M. Tyson
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