If he accelerated his sales dramatically from here, then perhaps it would be quite a red flag. As for now, I would interpret this as a natural event for a strong leader when he steps down from a company.
Flipping options after the stock has traded well is one of the most common insider trading patterns.
There are more interesting companies with . . . stronger insider (buying) patterns and frankly more exciting growth.
Why spend time trying to read this guy's tea leaves?