I agree with this. It sure appears that he took sides in the US election in 2016. It makes sense to see a 50/50 split in support, likely correlated roughly with political partisanship.
Easy to see someone who published secrets related to american imperialism, would publish secrets about the candidate that was viewed as imperialist at the time.
A charitable interpretation of his choices in 2016 would be that he thought he was bloodying the nose of the next US president, that he assumed like the rest of us that obviously Clinton was going to win.
But it remains a fact that he chose to spill damaging information about one side and not the other, even though he had information on both. Unfortunately for him, the side he helped turns out to be just as eager for his head on a pike as the other would have been.