Confused? Why? It’s only been 368 years, what’s your hurry?
Seriously, it would be interesting to know if that announcement is specific to Lucifer, and if so, why. In 1625, Urban had already promulgated his Sanctissimus Dominus Noster, which forbade veneration of the dead or publication of private revelations without approval from the local bishop or the See, and in 1634 another reserving both canonization and beatification to the See. It’s likely that Urban had no intention of actually reviewing Lucifer’s sainthood. A century later, Benedict XIV wrote De Servorum Dei Beatificatione et de Beatorum Canonizatione, which is still The Work on canonization. The rules have been revised as recently as 1984, but don’t seem to have changed very much.