The intent is not at-home fabrication: It's sending it to a company in Shenzhen (e.g. JLCPCB) to do both PCB fab, and SMT assembly for you. 10-day time between order and arrival. (USA), and astonishingly low cost.

PCB are sometimes used in these structural scenarios, (Where they are not the right tool for the job) as they're one of few(?) ways to get a custom part fabricated at low cost. If the device has electronics anyway, the added cost of expanding the PCB footprint for structure, as in this case, is small.