One thing I've wondered- why is the other character a variable field on Any% and not just split into its own category?

I'm wondering if someone can clear this up for me: Is timing officially based on in-game time or play time. It seems the 2 runs here are using conflicting methods. I looked up Omnigamer's SGDQ17 run and he went off a timer for that run, but in his WR runs for both categories he uses the in-game time. I feel like it should be expressed somewhere as to what the standard is. Any clarity would be great. Thanks!