The results seem plausible, but it's worth noting that the source of their data (Ahrefs) is just a rough estimate. Given that every publication they examined - including several outside of the tech industry - showed declines, I'd hope they would confirm that it's not an artifact of the estimation process. Ahrefs themselves caution against using their data to make these sorts of conclusions:

>While these estimates don’t, and can’t, show you exactly how much organic traffic a website gets, they work incredibly well for comparison. For example, it’s fantastic for learning if your competitors’ websites get more or less organic search traffic than your own.

(https://help.ahrefs.com/en/articles/1863206-what-is-organic-...)