And Agile and other buzzwords in software development is similar to, and benefits from the concepts of Kaizen and lean manufacturing which were heavily developed by Japanese manufacturers, like Toyota and Honda and enabled their growth thanks to their advantages in efficiency, quality and cost.
Agreed.
And the Nummi plant was a collaboration between Toyota and GM in the 1980s. That's the plant that Tesla bought years ago. They're only using a fraction of it for the Model S and Model X. When the plant was running in the past, it was capable of 500,000 cars per year. Tesla already has the facilities and the know how to scale at least that high.
Musk has a background in physics, software development, and financial transactions. He's versed in Agile development on the software side and has bought those practices to manufacturing.