Since 2014, Lockheed has expanded the volume of the concept by a factor of 100. So the power density is now comparable to ARC, about 0.5 MW/m^3. It won't fit in a truck, and has a power density grossly inferior to fission reactors. So, even if it "worked", it would be economically useless.
Unless the whole thing is just cover for some other dark money project.