Showing sources serves two purposes: giving credit, and making statements verifiable. What he did in that thread is just opy/pasting text from different sources together into an incoherent post.
Each citation should have it's individual source link, and it shouldn't be literally copied. I don't think this text would require 9 different sources if it wouldn't be copy/pasted together.
I'm pretty sure it's only meant to earn Merit.
*Since this is a debated case, and open to interpretation, I won't report it as plagiarism.
There are some parts of the discussion that can be accused as plagiarism even stating the source/credits of the original content. I beg to disagree in this kind of act, knowing that someone took credit for other's work. If this kind of activity didn't paid attention to, then it will spread across the entire platform.
When worse come to worst, some accounts would abuse it and can't be tolerated. As far as I can remember, when attending actual forums, discussions should be stated by their own perspective and opinions. If you're using others content, make it sure that you're using it as a basis of your own topic or for elaborating some critical analysis.