The larsen variation is very similar to ...exd4 KID lines, especially if white plays c4 and f3. But white can also attack in sicilian style except black doesn't have c file counterplay and the long diagonal to me doesn't seem enough to get serious counterplay. But, the open e file allows better defensive chances because it prevents possible e5 moves and attacks e4.
This is a continuance of another post of mine in which I challenged this group to find some redemption in for the Philidor Defense (1. e4 e5 2. Nf3 d6). While lines these are nothing new, I feel that they are somewhat overlooked. With that being said, let's see how the Hypermodernists Larsen and Nimzovich approached the defense.