The quote is Losurdo’s critique of Tronti’s book where Tronti imagines Lenin in modern England, but only limits himself to trade unionism without analysis of imperialism. You can find it here.

The connection is that midwesternmarx takes a similar stand in not analyzing how the working classes of the imperial core (and particularly the settlers in the US) benefit materially from imperialism. This material basis is the source of their misguided ideology which midwesternmarx ignore and instead write about “impurity” and similar concepts that don’t really explain anything.