This is pretty much bunk. There really is _very_ little space for manual unqualified work in solar panel manufacturing.

Does the supply chain contain less-than-free labor somewhere? Likely. Most probably somewhere in the raw material production, but it's not something that is a deciding factor in anything. These materials just as well likely go into making of iPhones and Lenovo laptops.

Unloading, Frame assemblies, testing, Cleanup of any failed products (this is skilled labor)... Packaging and loading. This is at the plant that does panel assembly (joining silicon to packaging).

The problem is that "Highly automated" does not mean "free of people" ... the demand for low skill labor (and a fair amount of it to keep up with automated processes) is still required.

The cost of labor in china remains so low (on the whole) that these things are still not only feasible but cost effective.