I also think this is false.Wallach said:Research showshacking Taggart's computer will cause Sandoval to be hostile. Even if you reload Sandoval will be hostile no matter what on that playthrough because of a bug.
I hacked it first, saw that my mission notes or whatever said I still needed to confront Taggert so I went and did that, perhaps it's because I did not upload the video onto his computer to further implicate him?