If it wasn't clear since you haven't mentioned it. Every single reason that he brought apart from testimony is begging the question.
Interpretation
His interpretation is through the lens he sees the world meaning of course whatever I see confirms what I see because I see it.
Logic
His way of using logic just so happens runs in accordance to what he believes so by him saying logic what he means is my way of validating myself is getting me these answers.
Commonsense
What is common sense? Well it is a sense that is common to people as in the people who you are surrounded by agree with what you see. Blatant begging the question because I can see evolution as just the way we became us but someone will see that as proof for a God. If I ask why and the person says commonsense they are essentially begging the question not presenting an argument.
I could include testimony but I don't want to.
If it wasn't clear whenever eternal is not demonstrating something to be true instead stating something to be commonsense, logical or based on my interpretation understand that this is simply him clearly showing what he thinks not how he got there. It is basically posturing. I hope you agree or eventually get to this conclusion because there is very little to learn from a person who does this and refuses to explain himself instead just spouts words that just so happen to arrive to the conclusion that agrees with him. Another problem with this is that what if you say it is logical that I am where I am? There is no discussion instead we appeal to evidence in the hopes we can bring about a better view of the world. If the person is not willing to give evidence all that he is giving is claims. At the point why bother even entertaining his conversation when you can entertain a crazed homeless man's conversation instead?
If it wasn't clear when someone doesn't demonstrate how they are right instead spout words like logical, commonsense etc they are begging the question as in asserting what they know is true without giving an argument for it.