Might those be just for other versions, like D462SB ? Just found this page
Difference between hubs D462SB and D162SB saying: "
Hub D162SB is more economical hub and it comes with steel axle and steel cassette body which are both mounted together as one whole.
So if you want to convert you hub from one axle size to another, you need to buy such axle along with cassette body as one spare part."
Soooo...I guess there's no opening my current one

But what I read the D462SB would fit this hub too. Just with it's new freehub and axle to go with the D162SB hub (?) Reason for this is that it seems quite hard to find the D162SB as many places offer just the D462SB for it.
Btw, here's the inner part of the hub as I removed the freehub and it's axle:
Hub