Channels haven't really changed since then, unless there was some significant evolution between 2016 and ~2018 that I don't know about. 2025 Go code that uses channels looks very similar to 2018 Go code that uses channels.
I'm also wondering about the internals though. There are a couple of places that GC and the hypothetical sufficiently-smart-compiler are called out in the article where you could think there might be improvements possible without breaking existing code.