*sighs again* It says PAL region because it's the region of the world where television works according to the PAL standard. The DSi/3DS is not PAL. Or NTSC. You missed the very first sentences in the article - PAL and NTSC are television standards.
The region locking on the DSi/3DS is in no way related to the television standard in given regions, therefore we opt for EUR, USA, JAP, KOR and iQue (for iQue releases only, meaning China) instead.
I'm not even being di*kish here, so don't treat it as offense, but the terms "NTSC" and "PAL" are ambiguous when it comes to handhelds, really. That, and they're factually not NTSC, PAL or anything else. I will stand corrected the day I see a sticker on a Nintendo handheld designating whether it's PAL or NTSC (which MAY happen provided the handheld will have a TV-OUT, but I digress).