The second paragraph, immediately afterwards, says: "Sadly it is not unknown for hyped-up scientific claims to be mistaken or exaggerated - claims of particles

The second paragraph, immediately afterwards, says: "Sadly it is not unknown for hyped-up scientific claims to be mistaken or exaggerated - claims of particles going faster than light, gravitational waves from the big bang, and so forth. I count myself a hard-to-convince sceptic. But what is being claimed will be the culmination of literally decades of effort by scientists and engineers with high credentials, and this time I expect to be fully convinced." ie., Sir Martin Rees (the author), one of the most famous astronomers in the world, is putting his credibility behind this. That matters.