I've not once seen that. In fact, coil whine is something I have researched extensively. Recent generations of Radeon cards have been very silent.
I can make few recordings for you, if you want.
Please stop. The chances with coil whine on AsRock cards are no different than ANY other manufacturer.
I spend a good amount of time finding out about experience of other RX 7800 XT owners.
Found that mostly affected GPUs were ASrock, ASUS TUF series, and even Sapphire Nitro+ series.
XFX and Sapphire Pulse/Pure series were among the least affected. That's what I found out.
ASrock Phantom Gaming RX 7800 XT is my 8th card from ATi/AMD and without doubt it's the worst one.
Among those 8 cards, 5 were Sapphire, 1 was Gigabyte and 1 was PowerColor.
When I ever first heard of coil whine, I thought that people are just being too sensitive, they don't use headphones ...
After some years, I got mine 7800 XT and I was able to hear buzzing sounds in all its glory even when gaming with headphones. That sucks.
Look, this is my personal experience and I made my previous post based on that and what I found on the internet (experience of other users).