The information comes from Wuhan dialect.

Wuhan dialect has basically no tongue rolling sound, so it can be said with a flat tongue. Wuhan dialect originated from Huangpi dialect.

Wuhan dialect is a local dialect popular in Wuhan, the central city of Hubei Province, and its neighboring areas. It is divided into southwest mandarin, Huguang dialect, Hubei small and medium-sized dialect and immigrant dialect.