Law blow

So I am a bit confused here.

Section 230 protected places like oppo from getting sued over the content posted here by us.

Let’s say I post Earth is Flat.

Oppo admins go in and change up my post to say - fact check Earth’s shape. They have edited my post or altered it to imply my post is not true.

I can then sue for changing what I said and infringing on my 1st amendment rights.

If they left my post alone and someone walked 500,000 miles and never found the edge of earth, they can again sue oppo for misinformation provided on their blog.

So one way or another, someone is getting sued and places like this shut down...

Am I understanding this correctly or is there some other way I am not seeing?

Mod Edit: There is no oppo, only Zuul