out of curiosity, what is that PVD material? I only know the deposition process, but i can't find any material called PVD.

PVD stands for Physical Vapor Deposition, a coating process, not a material.
Water coolers are usually either pure copper or they are nickel-plated, the gallium and indium in the liquid metal react with copper and form a compound, you then have to apply liquid metal again after a few months.
With nickel it looks different, this protects the copper from the liquid metal, so you don't have to reapply the liquid metal after a short time, the only thing that happens is that the nickel coating doesn't look so nice after some time.
But this does not affect the cooler.

Translated with www.DeepL.com/Translator (free version)

well "PVD" can mean deposition of a boatload of materials, that's why i asked.
"PVD" is not immune to anything. it depends what material you talk about.
By the way, discoloration of nickel does not affect anything. Unless you care to display the block after it has been used :p
I am not sure people would be willing to pay extra to have a block that is Gallium stain proof on a surface that no one will ever see in use.