IMNSHO, if you are wrong about something scientific, it’s just science at work. If the evidence is overwhelming for something, and you stick to your error, it’s then a mistake.
The UV portion of the sun’s output varies by a huge amount. This is new knowledge, gained recently. The effect this has on our atmosphere and surface and oceans is unknown. You are wrong, or rather your sources are. But this happens all the time. It’s the refusal to move forward, integrate new knowledge, and stick to your guns when you are wrong, that’s the real scientific mistake.