The system High Performance (HP) power plan may or may not have CPU core parking disabled by default. It depends on the CPU, OEM and form factor. Usually it has core parking enabled, hence the need for Bitsum Highest Performance (BHP).
'Disable CPU core parking during ProBalance restraint' does exactly that. During a ProBalance event, if CPU parking is not already disabled by the active power plan, it will be temporarily disabled. I don't recommend using this option due to the overhead in making that change though. Instead, you should use 'Performance mode' (marking processes to 'Induce Performance Mode'), which engages the Bitsum Highest Performance power plan.