Moore's play calls put players, and WR in postion to be open or not, McVay schemes his WRs open on many of his designs, but Moore relies on players doing all the work to get open and perfect exection. there are rarely any misdirection or forcing the defense to make a guess or pick a poison. so yes, Moore had a direct hand in it.
with that said, its also Dak as he is not elite, so how do you protect him and/or simplify it for him?
and how do you scheme such that Wrs are more easily finding open slots and forcing defense to react and pick a poison as said above and get one or the other WRs open. running 4 curl routes at the same depth is not that. running all WRs deep and the same depth is not it.
on that particular play, you have your WR lined being defended by a LB. why couldn't the WR get more separation...for Gawd's sake he is a dang LB. and then execution failed. everyone is focused on the throw, but there was a lot that happened before the throw...
plenty of blame to go all around.