After testing, it seems that it's the reputation bonus granted by Corvus that doesn't count in the satisfaction required for a faction to access their faction decision. Given that it was stated nowhere, I had assumed that this increase in satisfaction was equivalent to any other, and therefore during my tests in quickly passing the turns, I used the help of Corvus to have a quick idea of what bonus faction decision I would choose, to know with which faction I would improve my relationships. Which caused that visually I had reached the prerequisite for the next faction decision of a race, without it occurs.
Could you confirm this, Raze, by testing on your side? and if it turns out that this is true for you too, would it be possible for a developer to specify whether this is a bug, or if it's intended because using the help of Corvus would cause abuse such as having access to the 30 faction decisions available? I personally don't think it is an abuse because giving in to the dark side should allow access to powerful powers, in addition to cookies.
