Don't let the article fool you. They put a bit of a positive spin on it.
It doesn't really "solve" the image problem. If that probe was accessible they would definitely replace the optics on it. But being that it's millions of miles away, they can't do that, so they did the only thing that they could, which is work with what they've got.
When Hubble had image problems, they did the same thing for a while. They processed the images to get the most data they could out of them. But NASA knew that doing that was no substitute for good optics, so they spent hundreds of millions of dollars to fix the optics problem. They were able to fix it right.
Try it yourself- Take a picture of something with the camera in focus, and then take another picture of the same thing with the camera out of focus, and run it through a deconvolution filter. Look at the outputs. The blurry picture will surely look a little better than it did before, but it won't look anything like the picture that was focused correctly to begin with.
When you can't fix it right, you're forced to do the next best thing.