I think you don't know what the weapon is. The weapon is wielded by people who know better: by Trump, by Giuliani, by Hannity. They know the truth, but are cynically using their platform to manipulate the population. The consequences are destructive.
The opinions are not the weapon. The opinions are the wound, caused by the weapon.
Your point raises a couple of questions. First, do you think it is only your outgroup (Fox News, Republican politicians, etc) that would use misinformation? Democrats and other media outlets don't stand to gain from its use, or are too moral to resort to it? Second, the precedent this sets is that the government can state one set of facts to be true, and force compliance to that truth from media. Do you not see this as a potential problem? Even if you believe that your group would never abuse that power, do you think that they will remain in power eternally? Is it not possible for this "defense" against "weaponized misinformation" to be used against you?
> First, do you think it is only your outgroup (Fox News, Republican politicians, etc) that would use misinformation?
Can you point to any evidence anyone on the Democratic side of the fence has questioned the legitimacy of the last election even though control of the Senate may still easily fall into the hands of the group that prevented legal court nominations by an elected president while, under the very same conditions, rushed through the nomination to a SCOTUS seat of a judge that has barely three years of experience in that function?
The evidence that you request does not match the quote you pulled out. And even if the Democrats did want to further solidify their victory, that would be an extraordinarily foolish way of doing it, as any doubt cast on the legitimacy of the election furthers Trump's agenda, not their own.
The opinions are not the weapon. The opinions are the wound, caused by the weapon.