Greetings,
Welcome back to the forum.
I am not a HP employee.
Maybe a different forum member has more info, but the EVGA GPU liquid cooling solutions you reference are designed to work with EVGA products. Maybe the GPU liquid coolers can be adapted to other vendors, I don't know this for certain. I do know I would not buy a add-in product without verifying the product will work with the existing component.
HP gets GPUs from various manufacturers and the GPUs are built to HP specs.
Are there any codes on your 2080 which indicate you have a EVGA graphics card?
I am not into modding graphics card cooling. Also realize all vendors use Nvidia refernce designs. But each manufacturer can play with mounting points and other items.
No guarantee EVGA aftermarket liquid cooling products will work on all Nvidia graphics cards.
Regards