Idk about that. If you met someone from 100 years ago, you’d sure seem like an oracle to them.
So if someone a 100 years ago thought of a random number and asked this seeming oracle to tell them what number they are thinking of, would they be right 100% of the time? No. Therefore even to a critical thinker 100 years ago it would be trivial to prove you are not an oracle (a person who can determine what is fact without any chance of being wrong or not knowing).
As a species, we seek to define and understand the world around us, and the only way we can truly do that is by finding these universal truths and using them as lenses. I don’t think we’ve found many yet, but we’re working hard on finding more.
Nothing wrong with trying to refine your opinion and your certainty of it based ont he evidence and your own logic. Also nothing wrong with communally sharing that so we all have a collection of opinions that are educated and well thought out.
But no matter how much you explore objective truth you can never state a thing to be absolute truth beyond it being your opinion that it is an absolute truth. Sure it may or may not be actually an objective truth, but with no oracle capable of determining that it will always be your opinion. The only thing that changes with evidence (and should) is the confidence you have int hat opinion. It will never stop being an opinion.