If the heart was in fibrillation, no pulse would be detectable and the AED would treat with a shock pulse. CPR is worthless when the heart is in fibrillation.
Wrong on all accounts
No pulse would be detectable that is correct. An AED may or may not shock depending on how coarse the v fib is - very fine v fib can be mistake. for ash time and no shock would be administered. CPR is always indicated between shocks and for a full 2 minutes after every shock before a pulse check