Pretty much, Terry V Ohio they must have RAS, the ruling does not spell out whether they articulate it at the time, never the less they still must have it. If they find RAS later and they are caught they may blow their case a it may cost them some bucks. A illegal arrest is a illegal arrest.
Clearly in this case the police do not have RAS, the dispatcher admits to the caller that there is no RAS, yet the dispatcher inserts the RAS. The officers did not observe and acted solely on a second hand claim, which can be fatal. Primus seems to think in this case that a officer can pretend to have RAS making it legal. Hopefully his dept has a huge amount of funds to cover him.
The officers exceeded their authority and the dispatcher lied. At the very least all should be fired, if it had resulted in a fatality or injury all should be prosecuted. I do not advocate jail house rape, but then it is out of my control. I do think it is a fitting end to the butt of a situation such as this. Pun intended.