You’re right about that. The race was called the Xyrillians. I made the Retcon comment cuz they find it in Archer’s time but don’t use until Picard.
This planet was dubbed ‘The Amusement Park’ planet.
I thot I read in the Star Trek: The Next Generation Technical Manual about them using tech from this planet for holodecks but I just checked and I was wrong. Maybe it was in a novel…or worse some fanfic I might have read…oh no or wrote. It’s late and talos’ brain is fuzzy.