Consensus is a political term, not a scientific one. Science deals with things that either "are", or "are not".Given time and rigorous scrutiny, theories that remain unfalsified naturally become regarded as "true" or "factual" -- yes, with the full understanding that one exception could still "prove" it wrong. That can't make the scientific consensus "liars." It can make them mistaken, just as the minority who disagree with the scientific consensus may be mistaken, not necessarily "liars."
We use OBSERVABLE facts, and OBSERVATIONS, and MEASUREMENT to define the reality that is before us.
A theory is merely a guess about how that reality we are observing, came to be.
Thus, if your theory is not measurable, nor falsifiable, it is not scientific. It is pseudo scientific.