The RSS300 has 4 speakers: a woofer and a tweeter on each side. Only the tweeter is wired out of phase. The 2 woofers and the other tweeter are in phase. A full dipole would have had the woofer and its matching tweeter both wired out of phase.
This can produce a thin sound in the lower frequency ranges since you get more cancellation from the out of phase woofers.
A lot of manufacturers use only 1 woofer and 2 tweeters wired out of phase for this very reason. Also I noticed that some surround full dipole speakers are actually adaptive dipole, they just don't advertise it that way.
I believe the term Adaptive dipole was just a catch name given by marketing, who knows.