They're building televisions in an old lawnmower plant. For the most part they built a new factory inside the old one.

Not just that they mentioned that they could push that to a million cars annually but that it would be very unwise/taxing for them.

When it was full of Toyota equipment and staff.

Firstly, I don't think this way "easy". It may be easier. Secondly, I don't think that's obviously true. In fact, I doubt it. If you get into millions and millions you've probably already encountered and solved most every scaling problem you will ever have. When you are in the lower numbers there are multiple different levels of scaling, all of which need to be solved.

I don't think the apples to oranges comparison helps make the point anyway. It's just a throw-away. If someone writes "Toyota makes 9MM cars", I discard as "wrong thread". Even if the difficulty curve changes shape against Tesla starting right now, Toyota's production capacity remains pretty irrelevant.