Hey, I’m the author of the article. Despite its age, it’s still accurate and up-to-date.
> these features aren't entirely new
Depends on what you mean by that. These features are still not universally supported by all modern browsers, for example, so I can imagine they’re still new to a lot of developers.
Chrome supports all these features (except for String#matchAll, which is currently at Stage 3). Other browsers don’t yet support the full set, but they’re all working on getting there.
I make sure to keep the article up-to-date. It correctly states the status for each of the features. They’re all part of ES2018 with the exception of String#matchAll which is currently at Stage 3.
