This is true. Especially in the case of East Asia. How many words are loanwords from Chinese?Towards the end one of the interviewees said if these loan words are used by Japanese people in everyday speech, then they are part of the Japanese language. E.g. while one would learn that pa-so-kon is the word for computer, many may neither know nor care that pasokon is short for "pasona konputa" the Japanified pronunciation for "personal computer".
Long term depends on whether US gets chased out of Asia or continues to dominate Japan.
For example, Mount Fuji is usually referred to as Fuji-san (the Chinese way), rather than the "native" Japanese which would be Fuji-yama
Korean probably has even more loan words, easy example yuk vs. gogi (meat)
