Charles, you're reading the test report right, but you're emphasizing what're probably the least significant numbers in real-world home use. The all-channel driven number isn't what the rating is based on(the usual two channels driven measurement for five continuous minutes, to meet the FTC regs)and doesn't represent what happens playing music at home. Even one channel rarely would have to supply full rated power, much less all channels simultaneously.
It's necessary to read between the lines a bit and Home Theater Magazine is one of those which test at 1000Hz. At the 20Hz or 20KHz(could be either)frequency extremes the result would be on the order of 5-10% lower. The two channel driven results shown on the graph and described beneath it indicate that over 100 watts would in fact be available.
