Did Congress require Comey to report, or not?
If so, then the moment Comey informed 535 pairs of loose lips and their staffers, he might as well tell the rest of the planet.
IIRC in his do-nothing appearance before Congress the first time he was to keep them informed of any updates. This either was through his testimony, or by panel requirements.
What he did was updating the Panel and informing them per agreement in my book.