The risk of stroke due to AF has nothing to do with the technique used to ablate the affected area where the extra signal is entering the left atrium. The risk of stroke is mainly due to the poor circulation during AF in the LAA...the left atrial appendage. So, if the PFA or RF ablation, or even cryo-ablation, is being implemented, the LAA still retains its shape, and the blood still circulates poorly in it. Stale blood tends to clot, and that's why AF is so dangerous...clotting risk in the LAA. Stop AF = reduce risk of stroke due to AF by about 90%. PFA, but also any successful method of ablation, obviates the requirement to use a DOAC (direct-acting oral anti-coagulant) if all other risks/comorbidities are low. In fact, it is the patient's assigned CHA2DS2-VASc score (you can google that, and even calculate your own) that determines the total risk of stroke for all potential causes/risks.