The sheen is probably from using corn starch for thickening.
Oh no in old skool Chinatown places you can be assured its loaded with MSG the way its supposed to be if in doubt ask them Absolutely delicious and what I expect from a proper Chinatown place. I want the MSG it don’t taste like it should without it. Sucks for people who are sensitive to it but like peanuts that’s y’alls Fng problem not mine. I don’t change my diet or eating because some other chump has “issues” with it dont eat at that place then.