They may have increased orders in October based on stronger than expected sales. I wouldn’t rely on Bloomberg reporting to make the assumption that these are brand new orders.from wafer start to assembled chip ship for phone assembly you are looking at a 2.5 - 3 months lead-time, so if these are for increased 11/11Pro demand, it's too late ... if they increased orders now, its for the new iPhone that will be assembled in ~ Apr timeframe ... this article doesn't make a lot of sense to me.
And the iPhone launching in March would have orders put in months ago for delivery starting in February. Apple has the option of re-vectoring A13 originally planned for the lower-cost March model over to the 11 and 11 Pro, which are more profitable.
There’s no reason not to slip the launch of the March iPhone if necessary; they can continue selling iPhone 8 for as long as they need.