I can't because source 2's source code isn't available.
> Which is more likely - a company that dumps tons and tons of resources into Linux, Wine, DXVK, and put out the Steam deck didn't do this supposedly easy thing because they just don't care or could it be that they don't have the talent in house and wouldn't recoup their investment by doing it?
They don't have the talent? That's funny, considering Valve ported all their games to macOS many years before they ported to linux.