Since it's just concept art and not a screenshot, we still have to wait until the game is released to know which slogan will make it into the final game.
I'd find this specific one okay if it's discreet/subtle and above everything else remains neutral.
As in, having protesters displaying it, if it makes sense in-universe, would simply mean that DE:MD creators chose to convey their story to their 2016 audience by drawing parallels to the real world.
However, considering what it's referencing is an ongoing struggle to end the frequent loss of many innocent lives, it could too easily remind a person (IRL victim, witness, etc) of such tragic stories, which is probably not what one would want when playing a game. Even if it's not the game's goal, it can hit where it hurts.
Just change it to "Augs Are Still Human" and it's all avoided. Anyone can be offended by anything, but reducing the chances to its minimum should be encouraged.
Still, if it's just an in-game sign, at least it doesn't convey any opinion on its own.
Now if suddenly there's a question such as "What do you think of the Augs Lives Matters movement?" and as Adam you're allowed to answer "Its existence is useless and it makes augmented people look bad", we'd be dealing with extremely negative social commentary that will impact people IRL, mocking the efforts of BLM, and that has no place in any kind of fiction.
Let's hope their story deserves such references and that they never step out of it.