I don't see how that is multi posting, it was just trying to engage in a discussion with one of these users. Not copying content, just having a discussion.
Multi posting and copy/pasting are different things. What suchmoon tried to say is that you posted multiple posts, one after the other but you should have edited your previous post with the content of the new post.
Like in the example here:
https://bitcointalk.org/index.php?topic=1952324.msg49514523#msg49514523Posted on January 31, 2019,
11:54:43 AMJust a few minutes after that you make another post at January 31, 2019,
12:03:52 PMAccording to forum rules:
32. Posting multiple posts in a row (excluding bumps and reserved posts by the thread starter) is not allowed.
You can read about the rules here:
https://bitcointalk.org/index.php?topic=703657.0