I enjoy sci-fy articles and creative ideas. But they are funny to us now with technology we currently have.
First, we only need to create a magnetic field to surround Mars that is stronger than Earth’s. And we cannot use Mars’ iron core for this because it’s already dead. We can use inflatable bags that will stay in a synchronous orbit between the sun and Mars at a specific distance from the red planet. Sounds easy.
What in the world is stopping us? LOL.
Not much. We have satellites hovering at Earth's L1 right now.
Even simpler, just melt the core of Mars so that it becomes molten again!