I'm sorry to hear you feel it rings hollow. As you know, the secretary of state is Marco Rubio, who is appointed and confirmed by the senate (bipartisian-ish, I might add).
I am no fan of Kushner, but saying he runs US foreign policy is generously misleading at best.
It is a fact that Kushner (plus Witkoff) has been playing the role of primary diplomat of the USA in critical matters of peace and war. In many cases, Rubio is not even present at these key foreign meetings.