The Sentinal Raven grants the character the ability to see through its eyes:
"You can see through the raven's eyes and hear what it hears while it is within 100 feet of you."
The Bodak's Death Gaze ability
When a creature that can see the bodak's eyes starts its turn within 30 feet of the bodak, the bodak can force it to make a DC 13 Constitution saving throw if the bodak isn't incapacitated and can see the creature… Unless surprised, a creature can avert its eyes to avoid the saving throw at the start of its turn. If the creature does so, it has disadvantage on attack rolls against the bodak until the start of its next turn. If the creature looks at the bodak in the meantime, it must immediately make the saving throw.
So, if the Warlock is within 30 feet and averts his gaze, but the Raven does not, will the Warlock be forced to make the saving throw? This question leads me to believe that the Warlock would be able to target the Bodak, but does that count as "looking at" the Bodak for purposes of the saving throw?
Best Answer
The Warlock could target the Bodak using the raven's sight, but would still be a valid target for Death Gaze
There are two criteria for the Bodak's attack to work: the target must be able to see the Bodak's eyes, and the target must start its turn within 30 feet of the Bodak. The distance criterion is met, so the ability triggers if the Warlock can see the Bodak's eyes.
The attack makes no stipulations regarding how a target sees the Bodak's eyes, so it would seem the criterion cannot be circumvented in this manner through RAW means.