You're right but I disagree.
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Accelerator pump is to cover for when the pressure changes rapidly in the intake. There are two phenomenon occuring - one is the somewhat slow response of the low speed circuit, and the other the fact that rapid rise in pressure causes the walls to dry out.
This means any improvement in accelerator pump efficiency is going to happen during throttle opening from a closed or low throttle opening. (with mechanical secondaries this will be further into the throttle). At the drag strip, off the line, lets give it the benefit of the doubt and accept that it adds hp. Low rpm, low throttle hp improvement should make a big difference coming off the line. It should show in better 60' times. The better the suspension and the stickier the tire, the more repeatable the improvement should be.
Depending how distruptive it is to the airflow, whether that turbulance effects the bleeds or just the air going into the venturis, maybe it will also impact mid to high rpm power.