...bad PCIe ribbon cable. 10% shipped have the issue.

I realize warranty replacements are annoying. However, this quote does not do them justice. The actual response in the thread you linked:

Unfortunately, the people in this thread seem to have been affected by a bad batch of PCI Express ribbon cables that crept into a recent shipment of Corsair One units. These cables tested fine in the factory, and the problem only manifested after shipment.

We're aware of the issue and looking to remedy it as quickly as humanly possible. This affected an estimated 10% of Corsair One units that went out in the recent shipment, and is not representative of our normal quality.

We're endeavoring to have replacement units ready very soon to ship out to customers affected by this, and have added an additional check in our quality control process to ensure defective PCIe cables don't become a problem again.

They do seem to be taking this seriously and taking steps to ensure this will not be a recurring problem.