The article doesn't necessarily mean "old internet" in terms of internet culture or even the hosted services & structure of as such. She's talking about content, though most big swaths of that content was hosted on services, proprietary platforms or whatnot.

It's a noteworthy point. Over the last decade or two there has been quite a bit of churn and not much archiving. You can kind of estimate a default rate of social media bitrot, linkrot or whatnot...