I didn’t get that part either, it’s almost like he quickly threw that in there hoping it would stick. Why would Vereesa come to Halduron’s aid to defend Silvermoon from the Amani if she felt they were her sworn enemies? Why would Auric Sunchaser reside there permenantly as a high elf representative, and refer to all high and blood elves as “Children of Silvermoon” if it were their goal to invade and take over Quel’thalas.
And now with the faction-conflict dwindling, it makes even less sense.