Your question is answered in last 2 sentences of my article. In fact I was describing RAID4, but my goal was to make clear how XOR magic works for parity in RAID. My goal was also to make the explanation really easy and short. This is why I have started with RAID4 and referenced to RAID5 Wikipedia post which is already long and much more complicated to understand. The difference between RAID4 and RAID5 is only that RAID5 distributes parity and RAID4 keeps parity in a dedicated drive. It is not so important if you want just understand how parity calculation works.
So many other uses too! You can use one to do a double hip squeeze, which is bliss for women with SPD or pelvic pain in pregnancy, You can use one to lift a pendulous belly and drop a baby into the pelvis (sadly, most of us with 3+ babies have some degree of “pendulous” going on). You can knot one end and put it over the door, shut the door and then use it to support yourself in a squat. You can sift a woman’s bum (same idea as the belly, but sometimes feels better over the bum (done from the front, looking towards the woman’s feet if she’s on all fours). There’s also a version of sifting that has an exagerated tug to one side, which can help rotate a baby from OT or OP. So much, and so much I still don’t know either! I love rebozos. 😀 Glad you found them.
Random factoid too though – rebozos are also used as death shrouds, traditionally, and were a political statement during the revolution as well.