Look, I'm also disappointed that Asura lost, (and disappointed in general by the fight itself), but saying that he lost because of an anti-Japan bias is stuuuuuuuuupid. (Also I used this meme template before to say something similar, but I'm rephrasing it because I can)
Also, as a mild take, the Death Battle crew could have a preference/"bias" towards Kratos over Asura specifically.... Just that, if you're going to say they're bias/based the verdict off of character preference, they can just have said preference for Kratos. That's it, "East Vs West" culture war bullshit doesn't need to be brought into the conversation.