> The author says fake content is going to be too hard to identify so there is only one effective way to stop it
I strongly disagree with the author that there's only one effective way to stop misinformation.
Remember, the real problem isn't the existence or proliferation of misinformation, which is both incredibly subjective and impossible to prevent without a central source of truth which is fraught with ethical problems.
The problem is that many people uncritically believe anything they read, see, or hear.
You could solve the actual problem of misinformation tomorrow if there was a concerted societal messaging that said something like the following: "Everything you read online, from any source, may be inaccurate. People with money and power try and manipulate you for even more money and power. Verify everything with multiple sources, consider all possibilities and peoples' motives, and use your brain."
This will never happen because powerful people want to have their cake and eat it too: politicians want you to believe all of the words that come out of their mouth, but not trust the naughty "conspiracy theories" about them being insider traders, for instance.