So they renamed performance to mean efficiency and are now using super in place of performance?

Super is old "performance" core:

> The industry-leading super core was first introduced as performance cores in M5, which also adopts the super core name for all M5-based products

But new "performance" is claimed to be new design (= not just overclocked efficiency core from M5?):

> M5 Pro and M5 Max also introduce an all-new performance core that is optimized to deliver greater power-efficient, multithreaded performance for pro workloads.

quotes from https://www.apple.com/newsroom/2026/03/apple-debuts-m5-pro-a...