I think your understanding of the model is off. It definitely have nothing to do with “ghost” atoms. That is something entirely different.
What this seems to be referring to are what I know as “charge increments”. This is to determine the partial charges of atoms. For example the OPLS-AA force field has something similar. In fact, the value for aliphatic C-H bond appears to be the same (0.06). Thus check out the examples and explanations for assigning the partial charges to aliphatic hydrocarbons at this webpage:
https://sites.google.com/site/akohlmey/software/topotools/topotools-tutorial—part-2
Since this is an extension of an existing force field, you need to read those papers, too, and I am quite confident that there is some more detailed explanation.
Axel.