If I am interpreting this right, the Nemos technology has been designed to work in tandem with offshore wind turbines.
Cables are attached to the underside of the floating device, they then pass down through pulleys attached to the foundations and up the trunk of a nearby wind turbine.
Any movement by the floating device causes the cables to pull to and fro through the pulleys.
Presumably this action drives a turbine located in the wind turbine superstructure.
If this is right, the power take off system is high and dry and not subjected to the corrosive effects of seawater.
It would also mean, that both the wave and wind devices could share the same infrastructure and electrical architecture.
The power output from a shared array would be increased in both volume (from having more energy harvesting devices) but also reliability by having energy resources with different characteristics.
I would think both the Nemos floating devices and the submerged Ceto 6 buoys could both be used for different situations depending on the prevailing sea conditions.