Yeah, the same guy who "heard from a cardiologist buddy" of his that 'no amount of exercise offsets the damage of sitting for 6-7 hours a days' (absolute bullshit icydk).

you’re mocking his weak references but you’re not offering one yourself

I think it's completely fine to be extremely skeptical of, and yes even outright mock, the idea that sitting for 6 hours a day does permanent, irreparable damage to the body until proven otherwise. It's also probably fine to be skeptical-bordering-on-mocking of people who use sources that sound authoritative to push something controversial. It's really hard to become a cardiologist. They know a great deal about a lot of things, but you know what they typically don't know anything about? Exercise. They're not physical therapists, they're not exercise physiologists, they don't have PhDs in kinesiology.

Sitting is bad for you, sure. But some random guy's random cardiologist friend likely knows less about exercise science than a $50/hr personal trainer at your local Gold's.