Is this bike a good deal?

Hello! I'm looking to get into cycling and competing in triathlon events and have been looking for a used bike on Facebook Marketplace. I don’t know really much about road bikes and was wondering if this bike is a good deal? I would also appreciate any other tips anyone has about buying a bike on facebook marketplace/what to look for in a bike. Thanks!

Description:

Size Small Carbon Frame
Shimano 105 Brake lever/ Shifter
Shimano Dura Ace Front Derailleur
Shimano Dura Ace Rear Derailleur
Shimano Dura Ace Rim Brake
Continental Gator Skin Tires
$675