Update: I managed to get it working but it was a huge pain in the *ss.
- I downloaded the AMD driver cleaner tool vrom AMD.com
- The biggest pain was when it recommended to reboot into Windows 10 Safe Mode for better results. Win10 is suffering from a massive issue that gets users stuck in a safe boot loop. You can't access internet in the bootloop, which is required to log into your administrator microsoft live account (if you don't use a local account). Long story short, had to make a bootable win10 media creation installation tool usb drive thingamajig and redach all optional harddrives in my case to disable safe boot through a cmd line. DON'T USE SAFE BOOT in the AMD CLEANER TOOL, it worked fine with a regular reboot.
- Installed the latest (v20.2.12 or something) Radeon Software and the website browser source window no longer showed up in my footage.
Took me a full day. Mostly thanks to Microsoft, partially to AMD.