This is by far the most tricky part. Other teardowns describe this as destructive, however, it is possible to get it out in one piece:

Remove the USB-dongle.

For that, slip a very small flat-head screwdriver between the aluminium housing and the plastic piece.

I was able to wiggle it loose and get under a small lip to then remove it fully

Pay attention that two more plastic pieces will fall out. These are not broken of, they are there so the piece you just removed can be clipped in, whilst still having a "smooth" inside for the recepticle and USB-C charging port.