The inner structure (colored in green) is a thermoplastic elastomer that sits behind the sidewall/cover. Its thermoplastic properties allow it to fill in the empty spaces left by the black sidewall, completing the tire’s design. The sidewall seldom wears out, but whenever the inner block starts showing signs of wear and tear, all you do is switch the block for another one. Plus, the design aims at providing different blocks for different usages. So you could perhaps swap the green asphalt block for a, say, blue snow/ice block, or a brown terrain block, allowing one tire set to become your almost-permanent solution! More at YD.
I guess anyone can come up with ‘ideas’ that are not tested in the real world, but there is something here that makes a huge amount of sense.