Downward adjustment is due to NA underperforming due to shortages.
Expectations were ~15.72M for 2nd half. Split would have been 11.75M Q3 and 4.0M Q4.
US Nov ~1.1M estimate (expected was 1.3-1.4M)
US Dec ~1.3M estimate (expected was 1.9-2.0M)
(I am making up expectations to fit the narrative - but I do know that the forecasting mechanics would work this way).
Sell-through shortfall of 0.8-1.0M, which is why they slashed their FY forecast by 1M, meaning they still plan to ship 4M in Q4 (and after this result, I think they can exceed that if demand is there).