..maybe. For a given definition of malicious. The flip side of the eye-wateringly expensive and inefficient fuel they're proposing is it's very hard to get the radioactive stuff out of the SiC shell, even with explosives. And getting it to go into thermal runaway would require some exotic materials that can out-last the SiC as it melts.
Spreading tiny fuel pellets everywhere would still be horrible, but far more contained.
The dangers of this would be more diffuse. Large amounts of high level waste compared to a conventional reactor, double the mining, fuel fabrication facilities that are one hopper jam away from going chernobyl. If it were accepted, the industry would get complacent about cracked pellets and Kr-85 or other hard to contain fission byproducts would slowly accumulate everywhere and we'd have to spend 50 years fighting misinformation about how radiation is good for you while it builds up irreversibly.
Spreading tiny fuel pellets everywhere would still be horrible, but far more contained.
The dangers of this would be more diffuse. Large amounts of high level waste compared to a conventional reactor, double the mining, fuel fabrication facilities that are one hopper jam away from going chernobyl. If it were accepted, the industry would get complacent about cracked pellets and Kr-85 or other hard to contain fission byproducts would slowly accumulate everywhere and we'd have to spend 50 years fighting misinformation about how radiation is good for you while it builds up irreversibly.