There was ADS-B and it shows the aircraft crossing the country and crossing the Ballycroy hills at 3500 feet.
The CHC / ICG S92s are Mode-S only, the positions on FR24 / Planeplotter etc are MLAT guesstimates. At the time of introduciton there was no certified ADS-B transponder for the '92.
However they do broadcast GPS-derived position on AIS, which is not considered a safety-of-flight system.