Correct, NUMA is not yet supported. Also as far as I know Phi required additional programming to actually get good performance, NUMA issues aside. Since it is a discontinued product it's not something we'll be supporting. But Phi cards don't look especially cheap anyway. Hopefully you can put that money toward a new machine instead, one of the new Ryzens ought to get you a nice bump in performance without a huge cost.
- Oshyan