Because in addition to selling of his option shares he also told off all if the other shares he has been holding down to the minimum (250k shares) that he is required to hold as CEO based on the Intel governance documents.
In November he sold as much stock as he legally could in his position, not just the amount he optioned.
The holding requirements are contractual, not criminal - there's no law requiring him to hold stock.
The minimum he's required to hold is still more than $10M tied up in a single stock. Wanting to diversify one's assets past that level is understandable.
You missed the point, it implies criminal if he sold down differently this time. The contractual details are only important in so far as they dictate his behavior.
it shows the concerned trade is not a part of the regular trades, the portion sold in that batch was significantly different to the extent that he couldn't sell any more when also retaining is position in Intel. In short, he used inside information to minimise his exposure to the risks.
In November he sold as much stock as he legally could in his position, not just the amount he optioned.