I just realized that there are two parts to being considered a homeless minor for FAFSA purposes (being considered independent), and it doesn’t sound like this student meets the criteria that he does not live with a parent. I think qualifying for homeless under the MV Act is separate from qualifying as an unaccompanied minor.
This student would seemingly qualify for the Maryland Tuition Waiver, because I don’t see “unaccompanied” in the information. And TBH, using the parent information will on FAFSA probably result in a lower SAI (possibly 0).
I would strongly encourage you to contact the state office to discuss this particular case. It would probably be very helpful for the family if you could gather facts for them.