Do you actually have a source for this or are you just making some sort of wild assumption, because Ninja being a utterly crap-tier job would contradict the only conceivable reason I can see to believe this is the case.
The playerbase has aways exaggerated how powerful SAM is and that hasn't changed in years. I don't see anything here that's going to push SAM far beyond the other jobs that are DPSing just fine.
Accusations of them not knowing how the game works isn't going to be treated with any credibility if you post in a way that makes it seem like you don't understand how ratio works. This isn't a "you will always take 100% more damage from here on" adjustment.