I have no idea what this means. Apple insiders cannot buy shares based on inside information until two days after said info is made public.
That still doesn't make him wrong. What works for the short term doesn't necessarily conflict with what works for the long term. Icahn selling his shares when he thinks that Apple has achieved its value wouldn't cause a crash like some are suggesting. It'd dip maybe, just like it does ever other day on the newest bad rumour, but Icahn doesn't own enough for his trades to be so influential as to cause any panic.
Nor can Icahn own enough shares to cause in increase in stock price.