I don't dispute that A3 sometimes do that - block out lower booking classes during a sale, but I don't thin they have this time. Maybe you're just unlucky in choosing a busy day that has already rolled over to a much higher fare bucket. The same flights you mention are 81 Euro a day either side.

I was looking two days ago at flights NAP-ATH-PAS and, in Flex at the end of October, that has indeed reduced from 138 to 106 Euro so they haven't blocked fare classes there at least (that's S class btw - the sweet spot for points)