Well they're not directed at orthodox Christian Trinitarianism, that seems clear to me.No .. they are not misdirected.
The Qur'an makes it clear that "one of three" Gods is condemned, with which we agree. It says nothing about One God, three persons, which suggests it wasn't addressing the orthodox doctrine.The Qur'an makes that clear .. the term "one of three" refers to a trinity.
I would have thought, if the orthodox doctrine was being condemned, the Qur'an would not be so ambiguous as to condemn that which we do not say, that's the point, it seems to me.The complex theology of the trinity that evolved is condemned.
The "one of three" of the Qur'an refutes tritheism, as we do.