I think he means that because you have a 1070 in your sig, you should be looking at G-Sync monitors. Its competitor, FreeSync, would indeed be cheaper, but it won't work with your nVidia card. At least for now. Some say nVidia will never support FreeSync (or Adaptive-Sync, which FreeSync is based on), but judging from
the current market trends, FreeSync has taken the lead, and will become the industry standard (Intel has given their support for Adaptive-Sync, already), so nVidia will eventually have to swallow their pride and at least start supporting Adaptive-Sync.
But this might take a while, so for the time being, nVidia users will just have to pay the nVidia-tax in their monitors, or forego the variable refresh rate goodness.
I don't have personal experience on the G-Sync, but at least the FreeSync feature is really a game changer.