I completely agree.
I've often thought that there must have been plenty of Section 31 operations that didn't rise to the level of, you know, genocide, and that those operations were likely more ambiguous.
I'm hoping that whatever they're up to in this movie is more in that vein - almost certainly illegal, but probably more ethically murky?
Do we know that for certain? The cure to the virus was actually pretty fundamental to the Female Changeling ordering the Jem'Hadar to stand down. She refused to surrender until Odo linked with her and cured her.