en.wikipedia.org/wiki/Diospyros_kaki

Fuyu is treated by authoritative horticultural sources as a cultivar within Diospyros kaki, not as an alternative common name for the entire species.

• The USDA Agricultural Research Service's persimmon germplasm inventory lists Species: kaki and separately Cultivar: Fuyu, showing that Fuyu is one named cultivar under the species, not the species itself.
• UF/IFAS's cultivar guide likewise describes 'Fuyu' as a named persimmon cultivar: “'Fuyu' ... is the most widely grown persimmon cultivar in the world.”

So calling Diospyros kaki itself “Fuyu persimmon” is taxonomically misleading: Fuyu is one variety/cultivar of the species, alongside cultivars such as Jiro, Izu, and Hachiya.

The phrase “equally wide as long” conflicts with standard botanical descriptions of Diospyros kaki leaves.

A Flora of China / World Flora Online description gives the leaf blade as 5–18 × 2.6–9 cm. That means the leaf length is substantially greater than the width, rather than being equal. The same source also describes the leaf blade as lanceolate, elliptic, or ovate, which is consistent with leaves that are longer than wide.

So while leaf shape can vary, the article’s wording that the leaves are “equally wide as long” is contradicted by published size ranges for the species.