Let us assume that the person posted it off hand but is it good to have such a long thread but you just decide to quote the OP topic and post on page 9 or on a very long thread. Is that not a spam?
It's spam.
A good post is only good and helpful if it answers questions or concerns that was not answered by any previous posts, pages.
In your example, that post is not helpful because answers previously already helped OP to solve his concern or problems.
I only read two posts the first and second.
I can tell you you are sometimes right and sometimes wrong since depending on the answers if someone that really knows his stuff agrees with one post of the 50 made it would carry weight and likely prove that is the correct answer.
for instance I know a lot about mining so if I go to this thread.
https://bitcointalk.org/index.php?topic=5575060.msg66426206#msg66426206my reaffirmation of what to do or not do would carry far more weight then that of many others.
Especially since I have an entire section on my YouTube channel with no links for profit showing ways to run quiet miners.
But in general most people reading the first two posts and giving an op quote without bothering to read the other posts are not offering good info.
I would venture to say that my response here is significant different than others even if I did not bother to read the other answers.
note:
I will read them and post an edit right or wrong about my guess.