The housings are not sealed. At least not on the older Aura H2O models. That model's water proofing achieved by a coating on the PCB. I googled this in a panic when a significant amount of water came flowing from the USB port as I removed it from the bath.
IIRC, that is the V2, the original IIRC had a sealed case, with a plug at the bottom for USB and SD slot.
The "glue" he is mentioning on contacts probably isn't glue at all. There is no reason for glue to be there. Most likely, it was a waterproof coating.