Here's my take:
The big problem is Airbus don't specifically use the term RAIM in their documents (not much anyway)
This is a quote from our FCOM;
"When in IRS/GPS made, the GPS PRIMARY status combines two different criteria:
- The accuracy criterion (HIGH / LOW accuracy)
- The integrity criterion: This is the capability to detect a failure and provide appropriate warning of it."
Additionally
"If the GPS data does not comply with an integrity criterion that is based on a Horizontal Integrity Limit (HIL) and on the automatic detection of failed satellites, the FMS rejects the GPS mode and uses the radio position update"
I have always interpreted the "detection of failed satellites" as a loss of RAIM.