Is there a large dataset of anonymized DNA samples that we could try this tool against? Does 23andme do something like that? I hope they don't but it would be very useful for just this one case!
There is a lot of anonymized genotype data in the 1000 Genomes Project (http://www.internationalgenome.org/data), but the devil is really in the genotyping details with this kind of thing. It looks like in the validation project (https://www.documentcloud.org/documents/4113877-1-19-17-Exhi...), they went from biological samples to sequence data to analysis results, which is the right approach.
With this kind of low-througput genotyping so much depends on the accuracy of the genotyping method, though, which in turn depends on the lab, the protocol, the technicians, and sometimes even the weather. The software is not where I would start, in worrying about forensic evidence based on this method, though it definitely could be a source of errors.
It's considered a critical QC step.
Throughput doesn't matter if you have false-positive or false negative errors that cause erroneous medical decisions.