I doubt it'd raise that much (the article states £1.72bn), as there seems to be an assumption increasing the tax wouldn't lead to a reduction in SUVs, and that everyone would just absorb the cost.
However, I still say go ahead! Even if it only raises a quarter of that, that's still money coming in, and it means fewer SUVs on our roads. That's a win-win.
Windows is far more jank than a lot of Linux distros/desktop environments.
Like...
It's actually incredible how much money Microsoft has, and how much more they spend than probably all Linux DEs combined, but they've still yet to fix so much low hanging fruit.