No. They are about laughable. Look at the position his shoulders are in and the way he's looking (i.e., right at the QB, with his left shoulder back toward cethan). If Armstrong had checked back, he would have settled into his zone and been in a perfect position to make a play on carter coming across.
Anyway, the play was the play. I this system, the requirement is to make a certain drop, make a read and deliver it.
Armstrong made the correct read based on the numbers and who should have been blocked.
As I said, blaming Armstrong on that one is like blaming a QB fumbling during a mesh because a guard wiffed his assigned block on a DT.