I'm not judging or finding anyone guilty just yet, but others have pointed out, thats not what the chart says and there is nothing yet to refute they descended below a cleared level. 2 fairly fundamental errors if they become substantiated, especially as according to the report the aircraft stopped decending at 2500' and then the PF set 2000' in the FCU of his own accord
Just because something is in the database, is not a defence. Thats why we check it, no? I agree, it is a major "gotcha" and in this case it worked. I'm sure there are extenuating circumstances and we should all look forward to learning from them.
Which is my whole point. If the crew spent as much time thinking about where they were going to put the aeroplane as they probably spent talking about it, perhaps it might not have happened.