Even if one were to accept this premise (I don't) it is still a matter of saying but not doing.
“administrative mistakes”? That's another class of sin that I haven't heard of yet. Omission, commission? Yes, even ‘mistakes were made’ but “administrative mistakes”?
That sounds like “I don't steal but I'm willing to use stolen money”.
Yes, administrative mistakes versus teaching mistakes.
The Catholic Church is full of sinners and hypocrites. But the Church does not err when it makes a declaration ex-Cathedra or when the Pope says something in conjunction with the Bishops (e.g. a global Council of the Bishops).
Point out that there are sinners in the Church is sort of like saying that the sky is dark at night.