Potential problem with ‘Act of Communication by Media’ definition

[gregfowlerphd]

The definition says that an ACBM is an AC ‘in which some Artifact is used to transfer an Information Bearing Entity from sender(s) to receiver(s)’. I admit I might be confused here, but isn’t it an ICE rather than an IBE that is transferred in case of, say, email messaging (which is one of the subclasses of ACBM)?