This tweet is misleading (shocker, I know; Twitter and misleading ragebait—who could have guessed?).
It claims that "Up to 90%" (accurate, or at least plausible—but unsurprising) of "Every book you have ever read" (just untrue) is "sitting inside ChatGPT right now".
Meanwhile, 100% of the books that have been scanned into Google Books's scanned books collection are sitting "inside" Google Books's scanned books collection. And 100% of the web pages that Google Search has crawled and indexed are sitting "inside" Google Search's index of the pages it has crawled and indexed.