The source names laghman as a likely loanword from Chinese lamian and an adaptation of Northern Chinese noodle dishes, but gives no century, dynasty or decade for when the Uyghur dish diverged from its Chinese source.
What would resolve this A dated food-history source on Uyghur or Central Asian cuisine naming an approximate period for laghman's emergence as a distinct dish.
Openfood historyLaghman (food) (Wikipedia)