Let me preface the following post by saying this: I am not a diet person. I have never been, and likely never will be.
You might be thinking, “Wait, but isn’t Whole30 a diet, you dingbat?!”
So maybe I threw in the silly zinger at the end of your genuinely good question. Either way, I would answer your inquiry by saying, sure — in the sense that one alters their food intake for a period of time and might see weight loss as a result — I guess you could consider Whole30 a diet. But the other and perhaps less-glamorous side effects of this program far outweigh (lol diet puns) the weight you might end up shedding. Because of that, I wouldn’t necessarily generalize Whole30 as just a diet. It’s so much more.