The earthquake is a symptom of plate movement. That plate movement may well cause point source compression waves to slosh around in the mantle, and that might stimulate volcanic activity elsewhere. I would think subduction zones would act as baffles and reflectors of those compression waves.
I think what is interesting here is that the volcano has no direct connection to the fault moving in the earthquake. The earthquake triggering or influencing to eruption is not part of the volcano’s system of faults with direct relationship with the upward pressure of the magma.