I haven't read that issue of the newsletter yet.
However, there are some types of LED C9/C7 replacements (and even some versions of the mini/C6 strings) that should not be dimmed, and will be damaged if they are.
However, most of the newer ones will dim fine and are designed to do that.
I bought a batch of C7 replacements (from CDI) that I have outlining my roof, and I've already tested them with my Lynx Express. They work just fine...