Well, I guess my only remark on this would be that since God has provided that the Holy Catholic Church would not cease to be, and that it is required for Cardinals created via in pectore to have their names released by means of a public consistory, given the fact that even facing the dire circuмstances of the situation, one could conclude that the Pope could release such information publicly, without being too presumptuous of God's Providence and placing oneself in unnecessary danger, the latter point especially because in this case it would be absolutely necessary that this be done for the sake of the faithful.
I do not "judge" this action, rather I see the secretiveness of it to be unnecessary, given the Church has faced greater foes in the past. Death being only a fleeting thing if one is surely in the Church. A simple docuмent stating who these Cardinals are with a date, that is not a Word docuмent. This is sufficient.