That is precisely what confuses me somewhat. I imagine there are linguistics and methodology experts in any one of your divisions.
Do you not systematically trigger certain mechanisms before publishing a report?
This one may have concerned much more than linguistics. I do not know; I have not seen the report. Nevertheless, I think it would be necessary and natural for the figures in every report to be checked quickly by a certified expert in each of the divisions concerned. You may say that would really be an exhaustive task. However, a linguistics expert would undoubtedly have seen immediately that the Quebec language data for 2016 were incorrect. He or she could have called you and told you there was a problem.
Do you not systematically use this kind of process?