I don't think so. From what I can tell, it looks like a zone coverage play. Probaby either cover 2 or cover 3. Regardless, It's Smith's job to cover the left half (or third) of the deep field. He should not get beat there.
However, you deserve to get burned for a TD when you have Bart Scott covering the flat with Eric Smith backing him up in the deep half. That's on Rex. Ridiculous.