This seems to be a misunderstanding of the term "heretical".... whose testimony is heretical?
What you meant was "true"?
Heretical is determined by the status quo, or what we might call the "orthodox" position, or understanding.
This is the reason for this topic. I see a lot of fine folks throwing these terms around without a clue what they mean.
Heretical has nothing to do with true or false from my perspective.
More like approved of, or disapproved of, by the tribe.