Ah, that... actually, it is specifically referring to Ameraucanas and not Araucanas... articles can be great, but unfortunately sometimes crucial details are omitted...
Araucanas and Ameraucanas are not only different in having peduncles/tufts or muffs/beard, but also skin color and leg color as well...
Green or willow legs is the result of slate over yellow skin...
Ameraucanas have white skin, thus they have slate legs in all colors including white, except black which has black legs... and feet bottoms are supposed to be white...
Araucanas have yellow skin thus their leg/shank color is supposed to be yellow for whites, willow for all other colors and black in blacks... feet bottoms should be yellow...
They say green legs in an 'Ameraucana' is more likely to lay green than blue as the presence of yellow skin in that breed indicates an outcross and not pure...
Hope this makes sense and helps clear confusion...