6 tf is the total of the system, including CPU.
It is not a 6TF GPU plus CPU, this is an important fact and is being ignored in the assumption of the spec by many.
If the PS4 Neo (which was reported to be subject to change by DF) is 4.4tf in the GPU plus whatever rating the CPU is, then difference might not be much at all.
Are you just summing up teraflops of GPU and CPU to get total teraflops? That's an interesting approach. How many terraflops for the current PS4 CPU?