Hmmm I see this though also:

Product Details

Format: NTSC

Language: English, French

Subtitles: Finnish

Region: Region 1 (US and Canada This DVD will probably NOT be viewable in other countries. Read more about DVD formats.)

Mine arrives tomorrow. I'll update if there is a problem but I don't foresee one. They likely took the wrong product description.

Edit: US Amazon site with the same ASIN no mention of PAL format: http://www.amazon.com/M-s-h-Complete-Collection/dp/B00P4FU74K