Of the four features it claims are new in ES2023, the first two are false (but plausible, I suppose), the third is nonsensical (It's just destructuring), and the last feature was released in ES2017.
Since about 6 months ago I'm doing the classical "read the official documentation and changelogs", even if it's as bad as Microsoft's (their changelogs are good though). I guess we will enter a new era of RTFM while AI is maturing and we find methods for filtering AI generated noise.
Looking at it pessimistically the documentation is simply going to be gpt reading the latest code commits and breaking down the changes in a "documented changes" doc lol.