One of my most popular answers is definitely outdated from my understanding today. I'd like to either add a disclaimer to the top, delete it, or remove my name from it. However, it is closed and locked.
Who can help?
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Considering it's historically locked, the question and answers shouldn't be updated. That banner shows the content should be taken with a grain of salt already, so I wouldn't feel obligated to get the content adjusted.
If you want to remove your name from it, you can request disassociation of the specific post. That's explained here. Do keep in mind (as in part pointed out by the answer in the link) it's a drastic measure and has side-effects you may not have considered.
So how do I remove my name from a post?
If you would like to have your name dissociated from one of your posts, you can request we do so by clicking on the Contact link at the bottom of the respective page. Your username will no longer be linked, the username will be shown as "anon", and you will no longer earn any reputation from the post. All reputation you had previously gained/lost from the post including bounties will also be reversed, and badges you earned from the post may be revoked