Commentary - yes. However, if it is found that the model itself is not sufficiently transformative and including copyrighted fictional characters in it is seen

Commentary - yes. However, if it is found that the model itself is not sufficiently transformative and including copyrighted fictional characters in it is seen as an infringing derivative work, then even though the output of it may be used in non-infringing ways then litigious companies would still have an argument about copyright infringement on the model. Until that is settled, its likely that Adobe is taking the "we're not going to deal with any licensed properties in the model to avoid any lawsuits."