The "mobile" aspect adds complexity. Unlike PC, mobile devices have locked-down operating systems (iOS especially). Therefore, most of these scripts target Android devices, often requiring root access or a custom script executor like Arceus X, Fluxus, or Hydrogen.
The "Extra Quality" aspect of the script seems to refer to additional features or enhancements that set it apart from other scripts available for Cheese TD. Some possible extra qualities include: demonic hub cheese td mobile script extra quality