The decision to have Foxconn assemble the modules was made to save costs. Previously, Apple acquired assembled camera modules from LG InnoTek, Sharp, and O'Film.
Hyvision System will supply Foxconn with camera module inspection equipment in order to check if the wide, ultra wide and telephoto cameras' optical axis and image sensors are aligned correctly. If the alignment is off, the photo taken will be different than the image seen on screen.
Apple has purportedly ordered components for 90 million iPhone 13 units, an increase of 20% over the iPhone 12.
More details in the full report linked below...