It's statistics. Take out the failures caused by numpties, the grey area fails where someone might have done something not covered by warranty but they honoured it anyway, the failures caused by consumables (wear and tear on seals) and the failures that occurred because the owner didn't service within the service schedule and you're down to not many units. I'm still impressed with only 2 failures but out of how many units sold? Not many bikes come with OE Marzocchis and they must sell a fraction of the volume that Rock Shock or Fox shift.
I imagine the failure of my Specialized shock, even though it was clearly a warranty issue, didn't show up on their warranty stats as it occurred a month from the "one year or 150 hours, whichever is sooner". Spesh said I could send the shock for warranty work (2 weeks) by which time I'd be wanting to send it for service. So I ended up paying for an early service during which the bit that failed got replaced anyway. I bet this sort of stuff goes on a lot, too.
To summarise, don't believe stats when they appear as part of marketing bulls**t!