The specific claim seems to be that if the capsule were manned, the crew could have intervened, when the problem was first detected, to correct the error. With

The specific claim seems to be that if the capsule were manned, the crew could have intervened, when the problem was first detected, to correct the error. With no crew aboard, ground control was unable to make the correction because, at precisely that time, the vehicle was in a dead zone between communications satellites. It is not entirely clear to me whether this would have been the chosen course of action had it been manned, or whether it is merely being presented in support of the statement that it would not have created a dangerous situation.