We have to note that the presets address, or try to address, a shortlist of internal game settings from the OS or UI itself. This is a somewhat unconventional approach, we’re guessing partly inspired by game profiles, something NVIDIA and AMD have been doing in their drivers for years.
As you can see below, the presets allow for surprising options such as determining game difficulty, point of view (first or third person), and language settings. Basically, these spare you the need to find said settings within each game. However, Sony clearly states that presets only work with games that have such settings, and presumably support the preset function. This will not force Demon’s Souls to suddenly have an easy mode, because no such thing exists in the game code.