HTK weapons still have a an explosive charge as I understand them, but it's a very small charge, merely enough to help with frag (airframe materials etc) against the target, rather than an actual serious explosive warhead. I believe they use a very simple impact fusing system as well, rather than radar-based proximity fuses, which overall saves a significant amount of space within the missile body.
That image however may or may not be representative of the actual weapon L-M have in mind. They themselves have admitted they are having difficulty with USAF releasing classified details of the system, which may be a marketing ploy, but I suspect that image may be an artistic mock-up only.