If @Dr.Bitcoin_Strange did accidentally copy and paste, then why are some of the words he wrote different from the original post?
It's too simple. Many people use different types of tools to improve their English and Grammar, which automatically correct some words, and a few of them need manual approval before the correction. I always use a tool to detect grammatical mistakes in my writing, and that tool often changes what I write. For example, while I am writing this post, it automatically fixed several typos, but a couple of them are still waiting to be fixed. I am including a screenshot for better understanding.
But between the time of copying @Mrbluntzy's topic and posting the plagiarized text, this post was created:
How is it a matter here? This could be a reason why OP got distracted. He copied a post to quote it, but he opened a different thread and posted the reply you mentioned. This is supposed to distract him more to make that mistake. Yes, this proves that OP writes multiple posts at the same time. Not sure why he have to do it.