What gets presented in court is a "Detailed Forensic Report" that includes the timestamped audio waveforms, sensor locations, and screenshots of the multilateration computations. These reports, when used as evidence, are required to be available to the defense for rebuttal and crossexamination. One could, if one was so inclined, calculate shot locations by hand from these reports. The time stamped audio files are discoverable.

The underlying algorithms have been made available to defense teams in countless Daubert and Frye hearings. I have no idea what you're referring to by "a rules change like, last week."