The wifi is an off the shelf module. Its the metallic looking block to the right of the primary SoC. The metal is just an RF shield for the components underne

The wifi is an off the shelf module. Its the metallic looking block to the right of the primary SoC. The metal is just an RF shield for the components underneath. If you look closely, you'll see its a separate PCB soldered to the main PCB indicating its a separately produced SiP module. It does certainly look to be a well done design though.