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The heat sink used on the cooling system is a Nickel coated Aluminium alloy.
We do recommend to use of liquid metal compound on GPU.
That is the message I received from EVGA.. I guess i'm good?
More likely they mean "do not use".
Even if TG Contactnaut is not gallium based, like all the other liquid metals, should not be used with ALU. If it was copper like every other heat sink, you shouldn't have issues.
And that "cheapness" of EVGA recently, along side the castrated power delivery on their 1080tis (except the kingpin all others are limited to 250W), made me choose the Aorus over the FTW3. (Aorus Xtreme has 375W power limit on the PCB and a huge copper heatsink).