You should listen to yourself based on the results you've discovered through trial and error. After more than six years of training, you should have stumbled onto at least a few things that work for you and your body. Have you done any serious cardio or fat loss phases since you started training?
But as was said, the fact is you'll find differing opinions from credible sources on every topic, in the fitness world and outside of it. Some chefs make meatballs with just beef, some use beef and pork. Some lifters swear by the bench press for pec size, some say avoid it. Some people say don't use steroids if you're 6' tall and 180 pounds (ahem), some say YOLO. At the end of the day, you decide what to try and what not to and you decide what to keep and what to toss based on results.
But more on topic, fasted cardio was popular for so many years and was successfully used by many people (competitors and recreational lifters) that it'd be silly to flat-out say "it doesn't work." But it's just one application of one tool in the toolbox.
Want more of a headtrip? Here's a Roundtable article from 2005 with several coaches discussing fasted cardio. Thib himself lists some pros and cons:
Contrast that with this article from just a few months ago, where Thib lists mostly cons to fasted morning cardio:
Is he arguing with himself? Did the method itself somehow change? Did he evolve his professional opinion based on the experiences he witnessed with clients? Sure seems like a head-scratcher, huh? It's almost like there really is no one single correct answer to apply to everyone.