DCC capable is a relative term. My observations are that the latter such production the better, but still without a true NMRA DCC decoder inside (which they don't, but your DCC SHS engines do) you won't get as good a DCC experience as you can/could/would with a decoder, especially in terms of features, functionality, programming, and cross-system compatibility. Not to say with DCC-c engines you can't have some fun, just don't expect as complete or "pure" an experience. DDC-c engines, however, do seem to be improving as we go.
PS DCC system output to your rails is neither DC or AC voltage. Said meters do not give you an accurate reading. It is DCC. You need a meter that can read DCC.