With no discussion of valuation, balance sheet, long-term earnings outlook, market expectations, % float sold short, or risk factors for a short position, this can hardly be considered an analysis, let alone justification for a "major short".
AAPL is a high beta stock that has only slightly underperformed the S&P during a killer bear market, so you don't even have technicals or momentum on your side.
There must be dozens of better shorts than this stock IMO. In my experience, the best stocks to short are those whose core business sector is collapsing, have high debt levels and leverage, and have made major management mistakes in terms of product quality, brand, or capital allocation. Look at the death spirals of the last 12 months - CFC, LEH, MBI, ABK, BSC, C, most homebuilders. That is the stuff you want to look for. At the moment, the outlook for retail and consumer finance looks far more bleak than for tech, so that's another area to look which isn't quite so played out as real estate and bank shorts. Apple faces a rough environment, but their products, brand, and capital allocation have been very strong, and their balance sheet is extremely conservative with good levels of cash.