Cardiac ablation showed "extensive scarring"

cardiac ablation over two weeks ago, extensive scarring noted by dr in post op notes. I keep asking Dr if this is worrisome, as i see when googling (i know , i know) it can be linked to atrial fibrosis! He assures me it is not, but how can it not be?? I only had very sproadic afib episodes or 2 years, requiring 3 cardioversions. I am very sensitive to afib, i know I am in it even without a watch on, so i don't think I had many additional undetected episodes. It seems strange there would be such 'extensive' scarring after only a couple years, I thought that was always linked to longterm afib?