The first part of your answer explicitly says that you are repeating other answers, then you:
provide a link saying that the developer knows that the tool has a weakness explained by the other answers (does not add anything to the encryption question nor does it add understanding of the weakness)
provide a named tool as an alternative, which is a little ...
The question was not a question, and was closed accordingly.
The person who wrote the "answer" admitted it was not an answer and posted anyway, which they really should not have done. There is no point writing an answer to a question that does not exist. The answer may have been appropriate on another question but not here.
Thank you Luc - you did exactly the right thing. I am unsure as to why we never saw the update/edit, so your meta post is the only thing that would indicate the mistaken deletion.
I have undeleted the post. I have currently left in the OP's edit mark to ensure others don't vote to delete as plagiarism again.
This is the answer in question:
It looks like Schroeder was mistaken that the link was included in your question, you linked to https://keybase.io/docs/chat/crypto, while Jonas linked to https://keybase.io/docs/teams/crypto. Nevertheless, this is still a link-only answer. Since Jonas posted the link as a comment, you're not missing out on anything.
I'll admit, when I first saw your answer I almost flagged it. It reads a little bit like a rant and a little bit like an ad.
But, the reason I didn't is that part about the creator not considering it an issue. If that's not an exaggeration it indicates that the software will likely never be updated to fix it, and that could be considered enough added value ...
Answers that do not answer the question get removed.
Closed questions eventually get deleted by the system if there are no answers after about 2 weeks to allow for the question to be altered.
There is no similar grace period for answers in the StackExchange system, but answerers are free to post an altered answer.
I noticed the answer was deleted but had a high score and was a good answer, which I felt would still be useful. After asking what should be done in the chat, I flagged the post for moderator attention and asked that it be undeleted, which Rory Alsop has done. My flag message was simply:
This answer was deleted by its author because he was "fed up with ...
The reason is very simple and not about "infallibility". Mods do not get a notification when a deleted answer gets edited. The user did not use the comment section to ping the mod, so there was no way for the mod to get a notification.
The correct and expected process is to simply do what you did and to post here on meta. This is the place for this ...
The issue you have reduced it to is:
the core was unchanged
almost word-for-word identical
And then you asked if a deletion and repost is acceptable. I would separate those two things logically because you are co-mingling the issues. The question you should be asking is "when could it be acceptable?"
Frankly, I do not believe that your ...