It really doesn't count. The quote is "As her fate edges closer to the abyss, Slyvanus must decide how far she'll go to protect her people... and whether they're more precious to her than her soul."
It doesn't say what her choice is, only that she will eventually have to make one. It's open-ended. The only fact stated there is that her fate is indeed edging closer to the abyss. Whatever that means. On the other hand, she genuinely feels that the Forsaken "were a bulwark against the infinite. They were to be USED wisely......"
I honestly feel she might end up fading into obscurity. When was the last time the title of warchief had any significance? She has been absent since stormheim. Wtf is she doing? Every Slyvanus fan always wanks how powerful she is, why isn't she putting in work? Anduin has the excuse of being an inexperienced noob. But Slyvanus is supposed to be this "pragmatic genius"(lol trusting a dreadlord, real pragmatic..) who can employ genius "military strategies"(like raising your enemies immediately after dying to fight for you, Scourge style.)