I'd think the path from a false LOC BC GS signal would not look like the steady descent profile we see from the ADS-B data.
Btw I compared FR24 data with Flightaware data. They seem to be from different sets of ADS-B receivers (possibly overlapping), but the data over the runway match within +/- 25ft altitude and < 100m position along the centerline. I.e., both show the aircraft well above where it should have been, well past the runway threshold.