They’re referring to the fact that pity changes, and net nerfs to the class in a lot of ways, are coming in November if this PTR build goes live in that state. You can see them here in the blue post.
The only positive things in that wall of text are S&D isn’t a hard cast, crackshot resets on vanish or restealth, and some minor Fatebound changes, along with a few things for Sin that are good.
But we’re actually ignoring that they are literally killing Sub as a spec if the changes to remove Sepsis and Shadowdust go through. And that neither Trickster nor Deathstalker are getting any changes. Nor were any bugs that make the whole Crackshot rotation break addressed.
I can keep going with this. Point is, the entire thing is a big L beyond the S&D change, which was a long time coming.