Yeah, not wrong, is kind of annoying, but is also cool. SOS2 has always been a special mod in rimworld, great concept but long gaps between breaking updates and fixes. I totally get it too, the scope on SOS2 is kinda crazy for a mod, it's a lot. If you were going to replicate a rimworld mod as DLC, I can't imagine a better one to pick.
I do wonder how the SOS2 team is reacting. I hope they take the opportunity to scale back on some of the pieces they have to maintain and try to bring some of the stuff that doesn't make it into the official DLC into the newer versions.
It sounds nice, and yeah, that's primarily publisher responsibility, but developers are allowed to talk to their publishers about pricing strategy. Framing it as if they have zero responsibility is a bit of a cop out. Limited comments and we don't have the full story, but it makes it kind of sound like they didn't even bring it up.