Bad anti aliasing

Solution
Then it can't be Nvidia's fault. It almost certainly is the simple fact that aliasing happens and is more noticeable, and harder to correct on newer games with the rendering techniques they show. Adjusting the sharpness of your display can reduce how apparent it is. On your PC, you can force SSAA, or use VSR/DSR, or downsample from a higher resolution.
The guy mentioned the problem happens on his PC, his friends PC, his brothers PC and his XBox. Clearly the issue is modern games have more aliasing issues than in the DX9 era, where MSAA was able to fix almost all aliasing. He said it just happened all of a sudden, which most likely means his monitor was changed, or settings on the monitor were changed so that the image was either sharper, or the PPI was reduced, allowing him to more readily see the problem.
 

In the thread you linked before, he used AMD and Nvidia video cards, and 3 different systems. That's not the same as this link.
 
Then it can't be Nvidia's fault. It almost certainly is the simple fact that aliasing happens and is more noticeable, and harder to correct on newer games with the rendering techniques they show. Adjusting the sharpness of your display can reduce how apparent it is. On your PC, you can force SSAA, or use VSR/DSR, or downsample from a higher resolution.
 
Solution
BTW, your video only shows you using FXAA, which is the worst form of AA possible. MSAA would at least fix some aliasing around straight lines, and nothing short of SSAA will fix foliage and grass issues.

Nothing is wrong with it. This is how modern games looks. Look at a 4K monitor, or downsampling from 4K, or SSAA if aliasing is that bothersome. Or play from a long ways away. I've noticed that TV aliasing is barely seen at 15' away, but up close, I notice aliasing in all sorts of TV shows and especially commercials.
 
I think this right here is the most telling:
However as mentioned before, I don't believe this is directly a problem with my PC. This is because the issue is also obvious on my brother's PC, in the same house, who runs an entire different setup to me, and Windows 7 32-bit. And here's the really strange part; it also affects our two Xbox 360's, and our PS4 that was purchasing in January (2 months after the issue began for us). I can also notice it when watching sports/TV, to a lesser extent, which I assume is due to the lower resolution. Strangely, it doesn't seem to happen on games played via mobile devices such as iPhone or iPad.

There is no tech that can affect every device you have playing the game. The 2 devices you mention which you don't notice it on, has about 4 times as many pixels per inch as the rest. That simply means that you can't see it much, as the pixels are too small to notice.
 
Yes, other people see aliasing too. Just because you don't like aliasing, and the amount that shows up in current games, doesn't mean anything is wrong or can be fixed.

Buy a 4K 27" monitor. That will help. Otherwise, live with it. There is no way it isn't normal aliasing if 2 different PC's and an Xbox are experiencing the same thing that everyone on the planet sees. Aliasing can't be completely removed. It simply is not possible. New techniques have made some types of AA from not fixing all aliasing. The best you can do is downsample from 4K, or simply buy a 4K monitor. Make it a small 4K monitor, or you will see the aliasing just as bad. Find out how to use SGSSAA would also help. Unfortunately, the XBox will always have aliasing, and your PC's will require GTX Tixtan XP SLI to have a chance at running some current games.

You could also sit a lot further away from your monitor.