Surely no mistake
So quite Steven Knox - ""The first does not follow from the second. The point of testing software is to ensure that it does what it was designed to do,and that it is stable. But very rarely does testing reach to proving that the software does NOTHING BUT what it was designed to do, which is the gist of your first sentence."
In many cases yes that's possible but I don't believe that is true in this case. The audience for the data that was generated would, without doubt, be greater than a few software testers. At the very least developers would have had a peak at it to sanity-check it - they would immediately notice that it contains a lot more information than expected. And what about storage? The storage requirements would have increased if all this extra data is being saved - some one would have noticed. I fully accept that testers would not necessarily notice but I cannot accept that only testers would have looked at the data.