Higher clock speeds in processors always come with additional self-interference (crosstalk), signal degradation, signal reflection, etc. so such a significantly higher clock speed than typical desktop processors indicates interesting strategies and problem-solving. This article doesn't really talk about why, but performance being irrelevant, a 6GHz clock is notable. It's not implied unless you're not familiar with the problems of higher clock speeds.

Yes, it just comments that the I9 chip has speeds up to 6GHz. It doesn't imply a relation to performance unless you don't know what clock speed does in a processor.