Why does OSHA derating of 50% to NRR also apply to custom molded earplugs?

Does anyone know? I’m planning on getting custom molded earplugs of 26dB NRR from Starkey for concerts of 1-2 hours. These usually are 105 dB. Some even go up to 120dB or for longer durations so I plan on carrying earmuffs.

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There is a very long thread on this subject from a couple years ago. You might do a search to find it.
I understand where you are coming from.
If you are concerned use the ear plugs and muffs.