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How expensive?

expensive meaning electricity and depreciation cost of your equiptment, being allowed to be used for the network.

It's my understanding that no equipment is required for LN other than your computer. This isn't a mining operation. It's an off chain software application.

this cat on the video REALLY needs to use a whiteboard, and talk slower, and more deliberately.

This should explain in more detail why scaling is more of a problem than BCH says it is.

If BCH continues down the same path of increasing block size too much, it will eventually run into the same problems bitcoin core is facing right now. The reality is that Satoshi was very skeptical in the beginning of the success of bitcoin and that was stated in the original writings, so he didn't have to think that far ahead.