This sounds interesting but it most likely will only be of use in populated areas where there is enough signal overlap from broadcast towers. You’ll still need GPS in the countryside and on water.
Due to how OFDM works, I suppose the idea here is to intentionally send a heterogeneous signal on a few non-overlapping subcarriers (for single-frequency networks) or on different transponders at different locations (since single frequency networks aren't as common in the US due to how broadcasting evolved there, although ATSC 3.0 apparently also allows single frequency networks).