This is idiotic beyond the pale. First off, such a small mass (10 tons) will do little to stop or even slightly deflect a serious incoming body. Second, the gravitational attraction of such a small mass would have to be replicated many TRILLIONS of times and placed in orbit far from earth in fairly close proximity to each other to have any probability of intercepting anything and deflecting it. Think for a second about the surface area of the earth and expand that out until it is far enough away from the planet to have any chance of really deflecting anything of appreciable size.

Now, consider our current (and projected for that matter) lift to orbit capabilities. Even if we had a gigantic slingshot that uses NO ENERGY and only has to be aimed, which is capable of sending these things into orbit, how do the developers propose to park the deflectors in the right orbit without having on-board propulsion systems to slow their deployment into space?

As I said, this is idiotic and will never happen. Stop wasting money on this concept.

Obviously there is a propulsion technology being used that is NOT being divulged to the public. The only thing idiotic is that they have had that capability for decades and just now they are starting to consider its use.