Off topic from the OP’s submission title, but to me the most interesting segment was on mobile home manufacturing later in the video.

I recently learnt that at the time, the largest building construction companies were in prefabricated housing - in other words, mobile homes.

Stories about factory-built housing as a panacea to the affordability crisis still make it out as if the they are some new concept, but they’ve been around for a long, long time.