It may well be, it's been a long time since I looked at it.
The 'PC only' was in regard to StephaneB's post on combining ICC profiles and Epson ABW (not QTR), under OS X
Edit:
In the OS X|Lightroom Print tab, under Colour management, you need to set it to 'Managed by Printer' in order to access the Epson ABW settings. There is , AFAIK, no workaround to allow you to use, for example, Eric Chan's 3800 ABW B&W ICC profiles.