Yes.
"QFT" is a somewhat common internet abbreviation for "quoted for truth".
If one quotes someone else, and then posts, "QFT", they mean that they agree with whatever was quoted.
While Caveman's response was rather succinct, I assume that he is suggesting that you should die for linking to such inanity.
So, in quoting his statement, and following it with "QFT", I am indicating that I agree with him in that you should die (but only in a figurative sense, of course).
It's not really that complicated.