A couple of random thoughts. The zero (0) in "230 C" may be a random typo, or it may have been intended as a shorthand for the "degrees" symbol, wherein selecting the exponentiation function to emulate it didn't work. 20-23 C does seem a lot more friendly and room temperature like than 230 C!
The photo (or illustration - pretty small) looks like it has blue light leakage. This may be a sign that the plasma may be effective because it is radiating in the UV range and a little lower, down into the visible blue. The higher the photon frequency, the more energy it contains, and UV is a known killer of bacteria, not to mention possible carcinogen. This invention may just be a miniature tanning bed for those pesky bacteria. "The pathogens go in, but they don't come out (tan)." Wish they had made more details of the "plasma flashlight" public, but there may be money involved in conjunction with a medical equipment company, so that lack of candor is understandable if they are trying to get a patent to monopolize it for a while.