A magnetic shield for Mars is the concept in the link you provided. It reportedly arose from research into creating magnetic fields to shield space craft/stations from radiation, by diverting solar wind/radiation.
The calculations indicated that a 1-2 Tesla (10,000 - 20,000 Gauss) magnetic field generator positioned at the gravitationally stable L1 Lagrange Point between the Sun and Mars, would provide enough protection for gases to accumulate in the atmosphere over time, and provide immediate reduction of radiation on the surface of Mars. They do no say how long it would take, or how difficult it is to generate such fields.
In another
==> article <== I Googled this morning, NASA's director of planetary sciences division said he thinks "it" (thicker atmosphere, warmer climate, and liquid surface water) could happen in a human lifetime. Right, you're not going to go to sleep one night and it's the Mars we know and, presto, when you wake up the next morning, it's just like Earth. Each of the changes is going to evolve at its own pace, and for all of them to evolve so that Mars is "just like earth" one fine morning, could take (your guess is as good as mine) at least several lifetimes. And that's the optimistic estimate.