Yes, the logic is as follows:
PLAYER tab: The PC selects the bluff option {no scripts}
NPC tab: SUCCESS - NPC Response {Text Appears When Script -- conditional check for PCSpeaker's bluff skill}
NPC tab: FAILURE - NPC Response {no text appears when script}
If the skill check is successful, the NPC will respond accordingly and the failure response will never run. If the skill check fails, then the failure response will run.