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No, I conclude that a sweet-fruit-only diet is unsafe because (1) no mainstream vegan health organization recommends such a diet and (2) this diet fails to meet the 10%-of-calories-from-protein recommendation of the World Health Organization.
The United Nations World Health Organization (WHO) has published an exhaustive report on human dietary protein requirements:
https://apps.who.int/iris/bitstream/handle/10665/43411/WHO_TRS_935_eng.pdf?ua=1 . Page 126 of the report summarizes the protein recommendations of the WHO: 0.83 gram of protein per kilogram of lean body weight. For a 170 lb. (77 kg) person, this would be 64 grams of protein per day. For a physically-active person, protein requirements are higher than this.
The Cronometer nutrition tracker shows that your daily food intake, as posted on your website, is deficient in protein, zinc, selenium, and vitamin B12. Your protein intake is only 43 grams per day. Your calcium intake is 720 mg per day (this calcium intake may be adequate).
I retract my claim that your calorie intake is low. The Cronometer nutrition tracker shows that you are consuming about 2650 calories per day. Despite this, you still are not meeting the WHO's protein intake recommendation.
It appears that, for certain nutrients, you are compensating for low nutrient-density by eating a very large volume of food (2650 calories per day). This calorie intake would be excessive for a person who is not highly physically-active.
You could easily correct your nutrient deficiencies by adding legumes and nuts to your diet, and by taking a B12 supplement.