“I posted that, it was wrong, and I’ve changed” is a sentence most people are too proud to type.

Admitting an old position publicly costs pride and very little else. Most people would rather hope nobody brings it up, because saying it aloud feels like handing over ammunition. What usually happens instead is that the admission ends the matter. Being able to say you were wrong is a kind of freedom other people can see on you.

If something you said no longer matches what you think, say so plainly and once, without a long defense of your former self. Do not wait for anybody to raise it first. Then move on rather than arguing it again every time it surfaces.