GOGGS is indeed an ILS waypoint, defined in the ILS approach. A “normal” range for an ILS actually depends on the design of the approach and the results of the flight test. I base this on 23 years USAF ground electronics experience including NAVAIDS, and four decades of active flying.
If an approach is TERPED for a 21 nm waypoint to act as IAF then flight check is going to verify the localizer accuracy and signal strength at 21 nm plus a wide margin for safety.