Well I wasn't defending the validity or otherwise of MBTI. In fact I never even heard of it before. But when I saw scientific consensus being brought up it was a red flag for me, since this misconception has been so widely used (misused) especially to convince the public that Global Warming is a thing when in fact there's little or no evidence to support it.
Besides, Psychology is not a science in any meaningful sense of the word. Just a mishmash of conjecture and opinion which could only be debunked by more of the same. Which is to say it can't be debunked. No more than pink unicorns or big-foot etc.