That's one way of looking at it. Another is that SSDs are just a series of flash memory chips that add up to the capacity you're sold, plus some extra to use when cells go bad.

If you buy a 256GB SSD, you're probably buying 8 32GB chips and a controller.

Here, you're buying 16 instead of 8 chips, but two controllers. So they call it "two drives in RAID-0", but it's very little different from one SSD.

It's not 16 times more likely to fail; I think the annual SSD failure rate is about 30% that of a spinning disk. Even if the double controllers means a double failure rate, it's still statistically more reliable than a single new spinning disk.