That looks interesting. I can't comment on the validity of the methodology of testing coding skill used here. But in general, I'd say we desperately need some way to track changes in our own skills caused by AI usage.
However, this would of course be a financial threat to OpenAI & anthropic in case serious, long-term atrophy of skills can be proven consistently. So I'd expect this to be buried quickly, unless supported by an academically significant institution.