If you are talking about the budget re-release of Planescape Torment bundled with Soulbringer (that I recently got new on eBay for CAN$10), the box itself doesn't mention anything about NTSC. eBay (or the seller) most likely automatically fills in NTSC or PAL based on the region the game was produced, without differentiating between PC games and consoles.
Even porting a console game to PC, which is not the case with PS:T, I can't see keeping a video standard designed for TVs.
