That looks like the stuff my grandson builds with Lego.
First, it descends via aeroshell. Nothing new. Then, once the parachute is deployed, the heat sheild falls away. Then, the rover separates from the backshell and descends on rockets. Again, nothing new...both of the Vikings and the Phoenix lander did the same.
Here's the new part: at a predetermined height, the rover is lowered on a 7-foot long harness. Once the rover touches down and the sensors on the flying platform feel the load lighten, it releases the harness and the platform flies away to a safe distance.
Gee...what could POSSIBLY go wrong? Is there some way they didn't think of to complicate it any more? It's like Scotty said in 'Star Trek III: The Search For Spock'..."The more complicated they make the plumbing, the easier it is to gum up the works".
I predict something will go haywire with the goofy way they have this thing configured and it'll crash on landing. Millions of dollars...wasted.