You will have to sand into the bottom paint and barrier coat to determine the depth of those pinholes in the paint.
I suspect that you will find they correspond to pinholes in the hull that were not filled during the barrier coating process.
As long as the barrier coat and antifouling paint were of compatible chemistry, ( same manufacturer usually,) there is no reason to suspect problems at their interface. Your applicator was correct, applying the AFDP before the epoxy is fully cured does inprove the bondline quality.
BP
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