The link claims: "Multi speed chains from 9 to 12 speeds have inner width of 11/128″ (2.18 mm)"

Does it also cover a different tooth/teeth on ring width to work better for these more narrow chains? I did not see but the link also mentions: Note how rollers of all the multispeed chains are of almost the same width, only single speed chain being significantly wider on the inside.

Pitch is the same for all the chains – they are aligned by length.

Maybe only SS rings need wider teeth on rings and not even required as many conversions use road bike chains and rings.