It doesn't matter whether they claimed output or efficiency. If the efficiency is currently on the order of 20%, then the output is about 0.2 times the energy a

It doesn't matter whether they claimed output or efficiency. If the efficiency is currently on the order of 20%, then the output is about 0.2 times the energy absorbed. If we multiply that by twenty, we end up with an output 4 times the energy absorbed, which is of course impossible.