Might this be a typo?, was the question.

You answered rather obstructively, in effect -well, I was his source, dare you think that capital "I" would typo?

a) If... that would be my typo. (indefinite, imperial)
b) That is my typo. (definite, manly.)

Why is it that others can nit-pick and I can't?

I hope "wdf?" doesn't mean "what de ____?". That would be rude.

FYIIAEWIHTEMJ. (for your information, I am embarrassed when I have to explain my jokes.) Non-the-less...