they don't say much. I like that they are actually using the theme system and acknowledge that it's very powerful if you actually learn how to use it (I am using it too) and that not all games need to look like unreal and they don't use all the features of environment.
they also say the classic "you need 10 years to learn game making and can't just make a AAA game on your first try" that I have also become tired of repeating.
but not much about going from unity to godot, this was actually made entirely in godot and not ported, the video is more just an interview about the game and the company.