Probably. The author of the post I linked could not find any information on the Cerberus Pyrotronics INS-2 besides the fact that it was referenced in the IXL documentation.
This ad shows Gamewell advertising the system without the Cerberus Pyrotronics brand, so it was probably originally by Gamewell. I think the IXL was a modified version compatible with Pyrotronics equipment, since some IXL components used the INS name.