What do you mean by claiming to not have framed it as a legitimate theory; you're saying it's an illegitimate theory, as in, you yourself don't believe it's true?
It was hyperbole. I personally think that the language is clear too. Here's a good post explaining the usage of the phrase "For all I know" since apparently HN isn't familiar with the idiom https://english.stackexchange.com/questions/92207/what-is-th...
His statement was literally correct, and useful in highlighting a different perspective on what is known to be known. The negativity seems to stem from not taking it literally.
