Drivers seem to be installed right. Solus is not on that guide but when I try to install the vulkan drivers:
sudo eopkg it vulkan vulkan-32bit vulkan-headers
The following package(s) are already installed and are not going to be installed again:
vulkan vulkan-32bit vulkan-headers
No packages to install.
If I recall correctly RADV is bundled into the vulkan package.
EDIT: I do see the second link now and I did follow that Wine Deps guide for Solus.
EDIT2: Tried on Solus and Pop_OS! on two different devices following the docs step for step which really points that either the Installer Script is broken or the Game Installer is borked.