settle a debate for me - Cardio gives "bonus time" to a fast.

My co-worker has recently started IF, and he's using some iPhone app to track it. This app gives him "bonus time" for doing cardio, and I say that's not really how it works. His app will say he's 16 hours into a fast when he's only 14 hours in, BUT he did a 60 minute cardio session., so his time moves ahead faster. I say that it doesn't really work that way. He says the app makers must know what they're talking about.

Can an expert settle the debate?

I use a Garmin watch to track my activity and the "active minutes" get bonus time if I'm in the "vigorous" category.... but that's just tracking active minutes, not related to fasting.