the fall of the west is now being documented through the new use of linguistic features.

Unc is short for uncle, and in the east, uncle is a common shorthand to refer to an elder who is about your father’s age, but not a member of your family. It can be used to refer to strangers “I gave the food to that uncle over there” or, as a nonspecific respect marker “Uncle John went to the market”.

Here “unc-mechanic” refers to a mechanic an older person might enjoy.

EDIT: One might be familiar with Ojisan from hentai anime
https://japanphraseadventure.com/ojisan-or-obasan-be-careful-how-to-call-middle-aged-people-in-japan-without-offending-them/