That only applies if you have some sort of arbiter to decide whether or not the "mob" is informed. And if you do that, you might as well have a dictatorship, as the arbiter can decide which side s/he thinks is well informed. Or rather, they could decide that groups X,Y and Z are not informed, therefore they aren't allowed to vote.
I know you may not be suggesting that explicitly, but that is the type of thing that I would argue follows from your line of thinking.
Are anti-vaxxers living in a dictatorship because we don't give their claims equal weight to those of doctors and scientists?
Making a statement such as "this was not democracy because the voters were not informed" carries a lot of implications. If it wasn't democracy, then the result isn't valid. If the result isn't valid, then you have to concede that you want to disregard certain peoples' vote based on the fact that they were not well-informed.
You then have to deconstruct that as to what it means to be informed, and who get's to decide that. Ultimately, someone/something has to make the call about who gets to vote, or whether that vote counts.
As much as I dislike/disagree with Democracy, one person = one vote is a line that is clearly drawn in most circumstances. It removes ambiguity, arbitration and interpretation. As soon as you open up the can of worms regarding "voting based on how informed" one is, then you have a huge slew of problems that I believe will very quickly lead to the realization that either you accept tyranny by the few, or the informed; or that democracy is not a moral and fair system.
Of course, the vast majority of nation-level decisions will result in more of a mixed bag of positive and negative indicators. Take, for instance, tax cuts. They aren't uniformly good or bad. To a certain level, they free up capital for people to spend (a form of democratic decision making, I don't believe markets are magical like some, but they are generally efficient and effective). Beyond that level, though, they remove capital for the government to spend on things the people (or someone depending on the type of government) has decided it needs to be spent on and drives up national debt, or curtails national spending which may have other negative consequences (reduced average level of education of the populace, reduced access to essentials like medical care, poor preparation for emergencies, etc.).
What I actually want is what we (in the US) ostensibly have. A democratic (the -ic is important) republic with a form of representative democracy. Our votes determine who represents us. Those individuals are tasked with making decisions based on various calculi (risk analysis, economic models, legal constraints and obligations, etc.). I do not want anyone to lose their vote, nor does my comment imply that. Universal suffrage is a good thing, giving everyone an opportunity, ignorant or informed, to have a voice. [EDIT: What I do not want is mob rule. There's a reason the legislature in the US was divided into the Senate and the House. The House offered a risk of mob rule, but the great opportunity for the people's voices to be heard. The Senate balanced this by giving unbalanced-by-population representation to each state. This acts as a measure of restraint against mob rule.]
[Sidenote: Can we abandon "s/he" and similar constructs? If the intention is to be more gender-equitable, switch to truly gender neutral terms like the singular-they, or one. S/he remains constrained to the binary system that, presently, is becoming outmoded. Not only that, but it's an awkward construct that is not easily voiced. An article posted here, I think, earlier in the week had attempted another sort of gender-balanced approach by alternating he and she in each paragraph while speaking about theoretical persons. The problem was this: the post was about a singular, theoretical person and it appeared as if the person was swapping genders each paragraph. What's more, the story didn't make sense because it was technically about two different people when it was intended to be about one.]
