That's what I thought too when I joined that site. What is it with them? They seem so preoccupied with being perceived highly intelligent, it just becomes a chore to be on the site. I thought that a fair few could be ISTJs too.
As an INTJ (and holding a few records and awards that help back it up) I can say its actually fairly difficult to tell who is a real INTJ, because it requires a level of competency so high that only an INTJ can spot it. Yes, that sounds exactly how you describe, but its true.
What makes an INTJ is being absolutely obsessed so much with efficiency or performance, that everything gets lost along the way. People arent perfect, and they often punish others for their mistakes, so we almost always have total disdain for other people. Thing is, a true INTJ does not believe people deserve to suffer for it, and in fact, INTJs get along very well with animals.
I am not what people would call a friendly person, people are often insulted by my body language somehow, but I have had a good deal of success with abused and abandoned dogs. This is almost a universal trait of INTJs.
We actually believe in the sanctity of life so much, that one of us once told Hitler to "Kiss my ass", and Hitler begged him to come back. This was Albert Speer, the only Nazi leader who wasnt executed or kill themselves. He actually convinced Hitler to divert 12 million people from death camps, of which 91% survived, giving them a higher survival rate than free Germans. Allied forces actually captured documents where he went far out of his way to try and find food for some slaves who were bombed out of their homes during the US firebombing of civilian Dresden, while leaving the nearby factory alone.
In fact, his memoirs were smuggled out of prison by a former Dutch slave who believed his life was saved by being diverted away from the concentration camps.
This was all while he was increasing fighter and tank production by 5 times, sub production by 15 times, and the same for almost every other war industry, in the face of the heaviest bombardment in history.
All that said, to be an INTJ, someone has to have a natural ability to organize and cross analyze information, and more importantly, be able to learn something in detail before ever actually doing it. If someone cant do that, they just arent an INTJ. We constantly ask ourselves "Can we do it better?"
And yes, it is true, we adore ENFPs. Something about how genuine they are.