Yes to both questions. I don't take deathbattle or their calculations seriously...it's the same company that said Rogue would beat Wonder Woman
Is Death Battle perfect? No. I staunchly disagree with a few of their posts, particularly Captain America vs. Batman as they left out a lesser known fact of Captain America getting 1000 years of experience and training during the Korvac War, but w/e. Fact is, they do a much better than average assessment of analyzing these things than almost anyplace I've seen. Part of the whole show's existence was to "solve" Goku vs. Superman and I think they came to a pretty airtight conclusion. That said, they use characters at their peak potential, which can often come as a composite, but in almost all cases, not likely. Superman at his peak potential has limitless power, the difference of the different variations of Superman is where they actually start powerwise. Any Kal-El Superman is the most powerful being on their planet.
And styles make fights. The circumstances of Rogue/Wonder Woman was neither knew of the other's power. WW is significantly more powerful than Rogue but any skin on skin contact makes the fight much more even, especially when Rogue could finish her merely by holding on. Do you disagree with this?