You don't seem to understand that this isn't about how our timelines are created, but evaluating them thereafter.
That theory sticks 2D games in the Child Line, so it would lead to the vote "In the Child timeline".
No, but its is a very good indicator. A majority of theorists will stick every 2D game into one timeline or another. Its not just because they're 2D, it just works out that way.
Also