I've never seen desperation from lack of sales of an Apple product come to the surface so abruptly. I hope this means customers have been collectively taking a stand against the new pricing strategy, as older iPhones (6s, 7, 8) continue to work fine for a lot of people.
I’m thinking you’re right, these trade in incentives that they’re offering is clearly a sign that they know consumers are retaining their devices longer than anticipated, which during the holiday season, Apple is hoping and relying on successful iPhone sales to close out the quarter, which of course, exact numbers are no longer available for quarterly reports.