10b5-1 states that directors and above must trade on a scheduled trading plan. They are selling more $ worth of shares right now due to their scheduled trading plan selling X shares every month/quarter that are now worth more $. There's not much o read in insider trading numbers than that because they literally cannot trade on the moment. They must trade well in advance using a scheduled trading plan.
The article you linked is malicious in that it doesn't even mention that these trades are scheduled. The data they took this from literally comes from the 10b5-1 scheduled trading plans yet they make no mention of this and the consequences so really there's no other way than to treat this article as anything other than malicious false reporting. It is misrepresenting facts to push a viewpoint.
Aren't those plans known for loopholes? For example, IIRC, you can register more than one trading plan (and only at certain times), but you _withdraw_ plans at any time. This lets insiders react to events in real time without having to register "new" plans, even though their overall plan has effectively mutated due to real time withdrawal of undesired plans.