That certainly is a strange bird, all right, and that blurb is amazing in how much it doesn't say.
Firs toff,your subwoofer is powered by that receiver. It won't work with another AVR. You'll need to replace the subwoofer.
As for the power specs, normally all AVR channels have equal power. The ways your receiver lists then, it reminds me of DPL receivers from 15 years ago.
And, yes, I don't see DD/DTS listed anywhere, but it DOES have HDMI. But, that'sno guarantee that the sould is what we would expect.
On the plus sice, 5.1 "implies" six descrete channels, which is only available from a digital audio feed. Yes, it does have six amplifier channels, but whether they are fed from a dightal DD/DTS signal, or a two channel DPL signal, is the question which they don't clarift.
Sorry I can't offer more assistance.