You're overestimating how many of the newest iPhones Apple sells versus "last year's model" and "two years ago" model and SE. You can google around and find a product sales mix for them, but from what I recall in the quarter after a new iPhone is released about 75% are the newest one, with that number decreasing over time until it is not all that much more than 50% in the quarter preceding a new iPhone release. There's no way they've shipped 200 million A14 and 80 million A15, I'd lop 25-35% off those A14/A15 numbers.Tell that to Apple who have already shipped:
200 million A14 @ 87.76 mm²
80 million A15 @ 107.7 mm²
20 million M1 @ 119 mm²
2 million M1 Pro @ ~250 mm²
1 million M1 Max @ ~424 mm²
All made on TSMC N5.
Still a lot, but your numbers would only be true if Apple stopped selling older models when a newer one came out. They get a lot of people saving $100 on that, and a fair number of the carrier deals for a "free phone" are getting last year's iPhone or an SE.