I’m not 100% sure but I checked the parent-class and this class and then did a search across the entire solution and there is no SetPeripheralVisionAngle() method. The only SetPeripheralVisionAngle() that exist are in PawnSensing. But Pawnsensing has nothing to do with AIPerception. Looks like a copy-paste mistake.
/** How far to the side AI can see, in degrees. Use SetPeripheralVisionAngle to change the value at runtime. */
UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Sense", config)
float PeripheralVisionAngleDegrees;
Same problem in the AIPerceptionComponent (which is deprecated anyway):
/** How far to the side AI can see, in degrees. Use SetPeripheralVisionAngle to change the value at runtime. */
DEPRECATED(4.8, "This property is deprecated. Please use appropriate sense config class instead")
UPROPERTY(VisibleDefaultsOnly, Category = AI)
float PeripheralVisionAngle;