The Arcane Church did not deliberately block the news. The news of Wuornos' failure to advance quickly spread among the upper echelons. The Federation of Light, the Crimson Dynasty, and many Beyond Grade As all heard about this, and their reactions were all different. Some were surprised, some were regretful, and many were gloating.
Originally, after Black Star opened up the Transcendent Grade, many Beyond Grade As also had thoughts of advancing, but with Wuornos' example, many of them suppressed their desires.
Even Wuornos had failed. It was better to wait and see.
Because of this, many Beyond Grade As also confirmed that Black Star was the only Transcendent for the time being and no one else had the ability to charge at this level yet. His position could not be shaken, which made them even more interested in the Promotion method that Black Star had yet to reveal.