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It's true that there are issues with low volume and transportation. Prefabrication works best for bigger projects like multi-family houses or apartments. Even so there are still some gains from prefabrication and related but distinct techniques like panelization: https://www.sciencedirect.com/science/article/pii/S1877705816301734
This case study compares panelization and modularization for a single house. It does not compare either technique to conventional building methods. I'd recommend reading the link I posted.
The link you posted just looks at Sweden and America and finds no clear evidence of overall construction productivity gains, despite them being wholly different countries with different regulations, environment, scale and market dynamics. It's not very useful, which is why I didn't address it.
My link is also, on reflection, not particularly helpful.
Prefabrication is not a silver bullet, it's just one part of a series of improvements that should be made. There should be prefabrication (especially in the larger projects where it's most helpful), consolidation of the construction sector, planning reform, expert management of large infrastructure projects and cost-efficient safety and environmental regulation.
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