Yes - report him.

Both examples that you have linked to are barn-door plagiarism. It doesn't matter if he adds a few words or changes the odd word or two - it is clear the post has been copied. He will receive a permanent ban. When you report the posts, be sure to include a link to the original post that was plagiarized. Something along the lines of "Plagiarized post. Original here: URL".

I've reported him too for good measure.