Labor aristocracy are proletariat still, just ones that are paid just well enough to have their interests (generally) align with the capitalists. For example, people who identify as “middle class” are labor aristocracy.

To learn more, I’d start with the source: Lenin’s Imperialism: The Highest Stage of Capitalism. In this original context it’s used to explain how companies use superprofits extracted from exploited colonies to pay off the working class in the developed world enough to blunt class consciousness at home and suppress solidarity for workers abroad.

Yeah it’s perfectly fine, labour aristocracy isn’t really a class in the Marxist sense but more of a shorthand to explain why some proletariat align themselves with the bourgeoisie instead of their actual class interests; they receive a share of the surplus value in some way, and this creates false consciousness.

We have this page on PW but it was written by the patsoc (purged) ex-admin: https://en.prolewiki.org/wiki/Labor_aristocracy