Everyone is overlooking the big picture on this huge market buy. It's not the material good news that it portends that's truly important, it's the fact that it shows he is aware of no bad news. Lack of bad news is just as important as good news.
It shows that this insider is aware of no bad news. He is saying that the shorts who claim the stock was going down on bad news brewing is false, that there is no bad news on the horizon.
Frankly, even more important was the moderate purchase by the company's corporate General Counsel who would have information related to various issues related to the company. The fact she bought with her own money shows that those issues the shorts have been spewing were false.
Lack of bad news is good news particularly when the share price has been beaten up.