I found a reddit post about it and I think you may be correct, though it seems like their hallucinations aren't 'full fledged' (they report seeing shadows, not people or what have you): https://www.reddit.com/r/Aphantasia/comments/baf5fv/can_peop...

I also found this study asking a similar question about many different types of mental illnesses, though some of it is about making people that have aphantasia better able to visualize to treat things like PTSD: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9614338/