After plenty of research and lack of evidence of the existence of this alleged dialect from either the user or other sources, I conclude that this is a constructed language (without an ISO 639-3 code). Deleting.

Here is an argument I gave in a private message on its non-existence:
"There is no ISO 639-3 code registered to any Japonic language outside of Japan. Based on the name of the dialect and the description, this user is from Alxa Right Banner (https://en.wikipedia.org/wiki/Alxa_League), where there are only about 2 dozen people who are not Han/Mongol/Hui/Manchu/Tibetan/Tu/Daur (there seems to be too few people to make 'many' forms of this dialect, as this user claims).

So, when would the Japanese people have migrated to the area and created this dialect? If it was within the last 2 or 3 centuries (especially during the 1930's), maybe the dialect would not have time to change to include infixes for grammatical person (as in the example). Also, WHERE did the grammatical person come from (Mongolic languages wouldn't have them). Evenki, or some other Tungusic language (I don't think they even live in that area)?

If the migration occured more than a few centuries ago, the word for 'eat' would have been more like たまふ or たぶ, surely not たべる, as well as ない remaining as ぬ or なふ."