i suspect they are writing iPuts as part of the buyback program because apples sort term volatility is collapsing toward all time lows and heavy put selling lowers implied volatility. so now would be a splendid time to buy both puts and calls because they are on sale.
short term open interest suggests they are selling the $420 strike and will defend this line with iBuyback bots.
buy was great it built a solid floor AND just wait they bought back WAY WAY more than people think. EPS will be up 5 % and a big street beat (of course bashers will claim that its only because of the buy back even though it will be a 10% beat)