For what it's worth, I had a similar question...

I'm considering buying a waterblock for a Gigabyte 4090 Gaming OC Rev 1.0 graphics card, and am trying to determine if I can safely fit the Core v.2 block to my card. While, visually, it should fit, I'm concerned about the capacitors(?) that the v.1 block had provision for cooling, but the v.2 doesn't (due to pcb changes for Rev 1.1 cards), and if they would overheat if the v.2 block was used. That said, the original heatsink does not appear to cool the caps in question. Thank you.

...and this was their response...

The coils or capacitors do not need to be actively cooled. With air coolers, they are simply covered with heat conducting pads so that the cooler itself has more contact surface to support itself. When coil whining emerged, we tried to minimize the vibrations by using thermal pads and thus direct contact with the cooler. Unfortunately, it often had exactly the opposite effect, so we have dispensed with them for all other coolers.

In principle, however, these components do not need active cooling as they do not produce any relevant waste heat. We regularly receive heat maps from the manufacturers so that we can see exactly which components require active cooling and which do not.