Finally some good news out of GF again. This actually seems so close to 7nm that it may have been wiser to name it as such (or 10nm) from a marketing standpoint. Node naming has little to do with actual feature size these days anyway.
IIRC, TSMC delivered a 2x density increase between 14 nm and 7 nm. Really, it should've been more like 4x, to justify that jump in naming, but at least it was big.
Anyway, the point is that these guys really can't call it 7 nm, with only a 15% density improvement. You have to keep in mind that one way chips (particularly things like GPUs, FPGAs, AI accelerators, etc.) get more performance by moving to a smaller node is by using more transistors. If they only get the stated efficiency improvements with such a modest bump in transistor count, that's only roughly half of the picture.
BTW, I wish this were the process that the RX 590 used. Then, it might've actually delivered a worthwhile benefit.