Okay, let's dive deep. The definition of "Blinded" in the God Machine Chronicle rules reads as follows:
The character’s eyes are damaged or removed, or the character is placed in a situation where eyesight is eliminated (a pitch-black room or a supernatural effect).
Effect: The character suffers a −3 penalty to any rolls that rely on vision — including attack rolls — and halves his Defense if one eye is blinded. That penalty increases to −5 and losing all Defense if both eyes are affected.
So, as described:
- The penalty for being in absolute darkness is -5.
- Vampires, as described in "Tricks of the Damned," function better in the darkness
— their penalty is only -2.
- Vampires with Acute Sense are even better than that — they have no penalty at all in pitch darkness. (Like the Strix.)
- Auspex doesn't do anything specific in this case; in 2e, Heightened Senses is no longer an Auspex power.
You appear to be reading a "thus" between those sentences that isn't there. It is true that they compensate with other senses; it is true that their penalty drops from -5 to -2. There may be a causal relationship there, but there doesn't need to be. Likewise, there's no corresponding ability of vampires to see through fog, mist, or other kinds of concealment that might relate to "dim light." This is a bonus to operating in the dark.