Molly Goddard, a fashion designer, went to the same school as others with the same name. They are all alumni of Central Saint Martins:
It’s either an amazing coincidence or an alternative fact perpetrated by Yahoo! Style. Or maybe it’s just an example of the writer’s and her editor’s ignorance. Perhaps they don’t know that alumni is a plural; its singular, when referring to a female is alumna. If they cared about such things, but were not inclined to use a dictionary, they could have used the gender-neutral alum or graduate.
I’m supposin’ that they don’t care, just as they don’t care that a dollar sign and the word dollars is a tad redundant. Or that placed should be place. Not only did they get the verb wrong, but they also forgot the other half of the correlative conjunction not only…but also in a sentence that resembles the word salad that could have been uttered by the current occupier of the Oval Office.