Do you see things with a confirmation bias? Picking only the parts of information you like or slightly twisting the story to suit your beliefs?
In the example above, no where was it stated that exercise wasn’t important but the person wanted so badly an excuse or reason not to do it, they twisted the story to justify their own opinion.
Of course exercise isn’t necessary to lose weight. You could create a calorie deficit by only controlling the food you eat. But it’ll be a hell of a lot harder if you don’t add some movement in as well. Not to mention the endless health benefits of exercise. Be careful not to listen and read only what you want to hear and see.