Eric Coomer, VP of Dominion Voting Systems, Explains How to Alter Votes

In this video, he is explaining the legitimate uses of altering votes. He cites the example of a voter who circled the square, rather than filling it is. 

The machine would mark this as a questionable vote. Then a human would look at it, and determine what the human meant. 

Obviously in this example, it is pretty straightforward, and we, as reasonable people can understand that the candidate box the person circled is the candidate the person wanted to vote for. 

But what happens is the human who looks at the vote is not "reasonable", but is instead a craven follower of one party?

For instance, Eric Coomer himself. According to this video, Coomer's Facebook page (which has been scrubbed) once featured posts touting Antifa. 

Is this a person who we can expect to be reasonable when counting votes?