The ability to spell "intelligence" somehow, oh somehow may correlate with your own intellect, especially if you recieved some education in english and come into contact with english language on a regular basis afterwards.
Also I really doubt anyone actually gives a fuck about why you choose to be a retard by misspelling simple words, more so when the post you linked to misspells it in a completely different way. Not to mention you have no rights to mock the english of others when your own english is subpar.