I believe that would be a 4-2 Nickel Cover 3 and so the outside corners are actually dropping into zone coverage and not specifically double covering the receivers
I believe that it is a 4-2-5 Nickel Cover 0, with Man under coverage no blitzer. That forces one LB to line up with a WR for double coverage, and the other stays in the middle for Man on the HB.
It's hard to tell if the outside CB's are going Zone or not, but the SS shouldn't line up man in a Cover 3?