More or less yes. And just like PC's the numbers game is quite meaningless. Sure his handbook says its 100W, whatever..
That celeron from the toyshop might be a 3.2Ghz with 512meg of video memory, but its still outperformed by a 1.6Ghz Core2 Duo, and 512meg of video ram is not enough info to know if its a fast (geforce 8800gtx) or slow (geforce 6200) graphics card.... But on paper it sounds impressive.
HiFi is even more confusing than PC stats to be honest, devices can have paper stats that look wonderfull but they still sound lousy, and paper stats that look terrible, but they really are amazing at making music.
Odds are the figures in his sharp handbook are so twisted, that they are meaningless. Legal yes as sharp can deliver the exact testing process, but meaningless. (Although if comparing two cheap music systems, they probably both use the same meaningless stats, so in a sence they can give some info).