Unfortunately, that's not true. It's often possible to create a consensus that's based on emotional drives, and no particular evidence at all. So the parent was correct in asserting that consensus is not necessarily a mark even of consistency with known and accepted facts.
My point was, in fact, that using the idea that something is accepted by a consensus (of a group) as evidence that it's correct is not a valid means of reasoning. It *is* a convenient short-hand that people often use, and it often works out "well-enough", but it's not a sound basis of argument. This is as true of "scientific consensus" as of any other. Usually, however, claims of "scientific consensus" are made by those who don't care to look carefully into the issues, or are explicitly arguing to people whom they presume would not be willing to look carefully at the evidence. You'll find that in blog posts more often than in popular science articles, and you'll just about never find "consensus" used as an argument in a serious scientific paper. It the people who look at the evidence agree, then many other people will be willing to take their word without looking into the evidence. E.g., I am quite willing to believe that a random line of code from the Linux kernel is doing it's job correctly, even though I'm certain that there are bugs present, and even that some people have identified some of them. And I *COULD*, in principle, study every line in the Linux kernel. Nobody does, not even Linus. Some people study proposed changes. Some people study apparent errors, etc. If you want to see what actual scientific discussion look like, look at the Linux kernel mailing list. It ends up with something that almost all people are willing to accept...but which some don't. You never get a real consensus in the strong meaning of the term. And that's true of science, too. The term consensus is used by those so distant from the actual work that they don't even know what's being done. And it's also a lie, even in the case of the most accepted principles. There are people who seriously deny the conservation of mattergy (matter + energy as related by E = mc^2). There are people who deny the big bang. There are people...well, name a believed rule and there are those who believe it isn't correct. And this is good, because very occasionally one of the wilder ones will be proven correct, but you can never predict ahead of time which one it will be.