Hyperacusis and tinnitus are two separate issues. TRT just helps the person learn to ignore and not get anxious about tinnitus.

Ear plus will not help ongoing tinnitus but can help hyperacusis. Tolerance or habituation training can help hyperacusis as you learn to not react/get anxious to sounds. But, some of us struggle to differentiate target sounds from ambient sounds. I hear all of the background sounds so I struggle to hear the target sounds, i.e. someone talking. I can improve my perception of the target sounds by closing my eyes and thus, reduce sensory clutter so my brain can focus on the target sound. Ear plugs reduce background clutter so I can focus on the target sounds.

If tinnitus manifests in reaction to loud sounds, ear plugs can reduce those loud sounds to reduce the triggering of tinnitus.