No, they didn’t just change the names. The created a whole new core that scales between efficiency and performance, which can run in a lower power mode comparable to the efficiency cores and in a higher power mode partway to the super (was called performance) core’s performance and named it a performance core.
Before:
"We have 6 performance cores and 12 efficiency cores"
After:
"We have 6 super cores and 12 performance cores"
"Wow, how did you achieve this?"
"We changed the names."