What? It was misinformation then but it might be true so its ok now? That means it wasn't misinformation then either.

Also who decides what is misinformation?

If I claim that aliens are manipulating our weather and that proof exists, when it doesn’t, that is misinformation. There is no evidence to support my claim, and it is wrong, even if I believe it to be true. If aliens show up tomorrow and announce they have been messing with the weather, then we have the evidence and it is true, but I was still spreading misinformation.

There was once this crank who claimed the Earth orbited the Sun, and not the other way around...

That was misinformation too, no?

No. He had evidence, based on direct observation. The claims made at the time with Covid and the lab leak theory had no evidence and were made entirely for political purposes.

Any unsubstantiated claims presented as fact are misinformation, and when that misinformation is causing mental and physical harm, keeping it off your platform is the easy, correct decision.

I'm not sure if you remember, but the early lab leak suggestions were leading to a lot of abuse, threats, and in some cases even violence towards people of Asian decent.