I've learned by now that one can never "assume." The How to Listen software appears to have been released around 2009. Sean Olive's blog from May 2009 describes How to Listen as "a new computer-based software application." However, the paper demonstrating the difference in performance (quantified by the F-statistic) between trained and untrained listeners was published in 2003. And the paper correlating measurements with preference score, where the listeners were trained, was published in 2004. And neither paper in 2003 or 2004 seems to reference any such "How to Listen" software. This strongly suggests that there could be differences between the training that was utilized in the published research prior to 2009 and the training that is employed in How to Listen. Now it's possible that How to Listen is essentially identical to the training received by the Harman trained listeners, just in a computer-based form, but I don't think it's wise to assume that.
Thought I got that inclination from somewhere.Just because they didn't mention it publicly doesn't necessarily mean they weren't using the program (or something similar) internally.