Actually thought this script only edits a post that has the Developer Tools window open, not until I realized it goes through all posts made by a user
There are different codes for both of those options. If you read TryNinja's thread, you will find the main code that corrects all broken links. But there is also one that works for specific threads/posts made by a user, and a correction code for mistakes that occurred with older versions of the code.
I read this thread title literally and understood it to be negative tag a user to update their broken image links
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You would have used the word "mention" instead of tag. Like mention a user to update their broken image links
Yeah, I see how it can create confusion. But I think I will stick with calling it 'tagging' a user. I have heard of 'tag' in the context I used it many times on the forum. And we use a similar style of communication at work to get the attention of specific work colleagues.