Well, except that the news still couldn't be contained. All those people died. They had friends and relatives who would insist on knowing what happened to them. Others would notice that those huge tower blocks, filled with people only a day before, were empty and dark. And an expanding "containment area" in a big city can't be hidden from the public. They had to be told something, even if it was only a half-truth, to explain the ongoing quarantine efforts and the death/disappearance of so many people.
Also, Nico was unconscious right up until the aid worker told him he would be OK. How would they know he was mute and why would they think a boy that age wouldn't be able to write?
Finally, I don't think the gas was a lethal gas. All of them, except Nico with his 1940s-era gas mask, were exposed to it and yet did not die or show symptoms of nerve gas. It was probably some sort of sedative gas, intended to put the residents to sleep so they wouldn't resist.
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