That sounds like a projection. I was talking specifically within the context of type in my second paragraph but replying generally to your broad question about facts in the first, I think it was quite clear.
Basically type is just a convenient framing device for reality and regardless of what I or you think it never becomes fact, you can be whatever type you want to be and so can I. As for my views, they are closer to water in nature except they are shaped by new information and experiences as opposed to an external shape from an object.
Don't mistake confidence of opinion with certainty.
I think what you mean is that certainty does not equal fact if something is an untested/unverified hypothesis.
I've done a lot of tests online and read a lot of sources before I concluded that I was NT, although all those seperate sources which did not verify the SJ idea are easily dismissed by anyone who is plugging away at that, the suggestion that SJs are conservative and NTs are either corporate libertarian or liberal visionaries I think is reflection of this forum too and in part why the labelling of people happens as it does, although there's two or three other things in play too, knowledge of peoples professions, also knowledge of what people believe they themselves to be and therefore if they clash with others what they believe those others "ought" to be according to their conclusions about themselves.
That's all brimming with confirmation bias. Its fair to ask why would one position suffer from the confirmation bias while others wouldnt, all I could say is that I've tested on a wide variety of different available quizes on and off line as the same, the I/E is borderline and that's the only thing which changes, and to my mind that is about as scientific, in terms of self-report tests, as you can get, more so than "from the little I've seen of you and know of you on this forum I think", kind of thing.
The role anyone finds themselves in can alter this, I read about teams in my work completing MBTI quizes and entire groups of people testing as exactly the same, ie ESTJ or ESFJ, which to my mind indicated little more than the candidates were thinking hard about what they thought the desired outcome would be and gamed the quizes to demonstrate that they were extroverted, sensitive, feeling and upheld the rules and expectations of their agency.