foot on center line... violation?

[mbyron]

Rule 9-5-7:
A player may touch the floor across the center line with one or both feet/hands provided a part of the foot/feet or hand(s) remains on or above the center line. Contacting the floor across the center line with any other part of the body is illegal.

I would say that, as quoted, the official was mistaken. Merely touching the center line with the foot is not a foul.