Old PAL tvs doesn't handle the NTSC palette and there for NTSC becomes black&white, usually S-Video becomes B&W too, even S-Video in PAL, they usually go hand in hand, if it would have a proprietary S-Video connector it would become color, there were usually 2 scarts back in those days, nr1 for comp/rgb and nr2 for comp/svideo, if there was only one scart and nothing else then there was comp/rgb. A few modern tvs only have one scart and have lots of input on the same but it's all way outside the standards, even Component on scart which is lightyears away from when the scart standards were set.
I'm the maker of that cable and it can be had cheaper here on the forum, ebay takes 5£ alone for having it sold there.