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Gilmour Space's own announcement (via its X/Twitter post and media release) states the record 110kN, 75-second engine test took place on 11 January 2022.
Wikipedia's Gilmour Space Technologies article lists the January 2022 static fire as "110 kN 75 seconds Eris hybrid First/Second Stage Engine", gives the Yatala headquarters, and describes Eris Block 1 as a three-stage rocket for up to 300 kg to LEO with Sirius hybrid motors and a Phoenix liquid third stage.
Independent space-industry outlet corroborating the January 2022 test details.[1]
Archived Orbital Today[3] article stating "On 11th January 2022, the engine was activated for 75 seconds, achieving 110 kilonewtons of force" for the Eris project.
Archived Business News Australia[6] report on the "75-second full throttle test" of "the largest and most powerful rocket engine ever developed in Australia", giving "over 100 kilonewtons (or 25,000 pounds)" and the hybrid-propulsion claims.
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