X says deleting your original post also removes its native reposts. It does not remove another person's quote post with their own comment, or a separate post containing copied text. First identify which kind of item you are looking at.
A repost depends on the original
A native repost shares the original with its author attribution and a repost label. X says it becomes unavailable if the original is deleted or otherwise removed. Someone typing RT and copying a sentence has made a different kind of post.
X explains native reposts and missing reposts
A quote includes another person's contribution
A quote adds the quoting account's own comment or media around the referenced post. Deleting the original does not delete that person's quote. Do not assume that removing the source also removes everything another account wrote about it.
X: what happens to a deleted post
For example, suppose you post an opinion, one person reposts it and another adds their own response in a quote. Treat the original, the repost and the response as separate items when deciding what to check after deletion. A total repost count does not tell you whether someone also wrote a separate response.
If it is your share you want to remove
Undoing your repost removes your share without deleting the author's original. A quote you wrote is your own post and uses Delete Post. Our existing repost-removal guide covers those controls.
Remove your own repost or quote on X
Check the remaining item before repeating the action
If something still appears, open it and check its author and link. Is it your original, your share, somebody else's quote, or a screenshot uploaded as a new post? Write down which one remains. Repeating a deletion against the original cannot resolve every different item in that list.
X also separates removal on its service from copies on other sites and search engines. A remaining Google result needs its own check; it is not proof that your original is still live on X.
Why a deleted social post can still appear in Google
Save anything you want to keep before starting. After an action, reread the specific item you meant to remove and record what is still visible. A completed click and a checked outcome answer different questions.