There are people that go vegan mainly because they care about their health.

I actually look it up on wikipedia:

Veganism is the practice of abstaining from the use of animal products, particularly in diet, and an associated philosophy that rejects the commodity status of animals. An individual who follows the diet or philosophy is known as a vegan.

And when you follow the philosophy of Veganism that means you cannot use any products that uses any animal products at all. You're telling me you don't have any animal products at all in your place or any of your clothes or personal stuff?

The author stated he went vegan for a day, and this is isn't because he wants to claim that he is a Vegan, it's part of creative writing.

He even added "I can feel that it's the perfect place for your health and wellness." So, clearly his main message to his reader focuses on wellness and health and not the deep principles of veganism or what you so called philosophy.

So, wether you go vegan because of the philosophy or the food diet you are called a Vegan.