No, you can't.
Whatever logic you muster up that supports you not being an alt through circular reasoning is flawed in principle and as such completely fallacious and antithetical of believable hypotheses. マホ~
Iban's theory has 3 things that he says are an indication of being an alt.
1) Age. He says that the reason I put 19 as my age is to make people believe my vocabulary or something. I'm not really clear on this point. However, the same thing could be said for Iban. He places his age at 18, only 1 year less, and he speaks with a fairly similar vocabulary. By that logic, he is an alt as well.
2) Curiosity about mundane features of the forums. This might be true, if I was asking about a mundane sub forum such as add-ons, or creativity. However, I am asking about the drama section, which is exclusive to these forums, as far as I know.
3) Gender. He says my gender is to "reduce the number of attacks". This is pretty much irrelevant, because I could say that he chose male as to sympathize with the male members.