I think putting the calculation, even if not an exact representation, is much more valuable than someone blindly stating "this is dumb because it's not exact". The precision is not the point, but to make it consumable for a broader audience and to educate how you can potentially better your long term life.

Also, a vegetarian diet does not guarantee any level of health. This is just the same as saying cutting carbs is healthful. Both state nothing because a vegetarian diet can very easily be high in sugar just the same as cutting carbs is not representative of eating diets high in whole foods.

Conflation and ignorance aren't productive.