I have sent your question to the company behind BitVoicer, but from the description on the web and the contents of their Arduino library it appears to be as you say:
BitVoicer is a Windows executable which can recognize speech and send results to a serial port. In this since there is nothing very Arduino specific about it; however, the website provides an Arduino library, very prominently included in the main download section, and someone (perhaps the same person) has also written this nice tutorial.
Good documentation and a well written tutorial are certainly to be appreciated. This might be useful to newcomers to Arduino who need to get voice recognition integrated into an Arduino project with very little time to spend, and have access to a Windows PC.
Mind you, I have not tested this software (nor can I, I'm exclusively Linux), so I'm just responding to what I see in this thread and on the BitVoicer website.