Upon googling "dead internet" or "dead internet theory", the first thing you'll get is this:
The dead Internet theory is an online conspiracy theory that asserts, due to a coordinated and intentional effort, the Internet since 2016 or 2017 has consisted mainly of bot activity and automatically generated content manipulated by algorithmic curation to control the population and minimize organic human activity.
This is of around 1/18/25
Interesting, right? A conspiracy theory. Keep that in your memory. Don't forget it, since you'll probably be seeing the term a lot. Here's a definition of conspiracy theory:
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And here's wikipedia's specific definition: