https://en.wikipedia.org/wiki/OPS-SAT
https://www.esa.int/Enabling_Support/Operations/OPS-SAT
Launch took place on 18 December, 2019, when OPS-SAT was injected into a circular, polar orbit at 515 km altitude.
Real-time tracker: https://www.n2yo.com/satellite/?s=44878
"Throughout the exercise, ESA had access to the satellite's systems to retain control and ensure a return to normal operation."
My reading of this: ESA let the teams attempt their hacks on the real satellite under supervision.
I guess I don't understand your implicit distrust here - it's just a 2 million EUR, 7 kg satellite explicitly launched for communications experiements.
It is a private press release by a company on its own site, advertising same services touted in the release. I assume every truth that can be bent in their favor has been done so by the PR and Marketing teams. However, the youtube video above with the interview seems much more unequivocal.
>Throughout the exercise, ESA had access to the satellite's systems to retain control and ensure a return to normal operation.
Was this a test bench or on orbit? The release seems to contradict itself. Did they do it on the test bench, and then for real?