You're right it's not only trade policy, but I think most of the fab contracts on current models were already negotiated and Apple ate $3.3B of tariffs as a COGS increase (delaying passthrough avoids spotlighting tariff-driven inflation). Increasing DRAM prices are a factor, but would not be a 20% BOM price increase at all (much less on the total price) for most of the impacted devices. The magnitude and the simultaneous across-the-line timing look more like margin recovery than a component passthrough.