If they do an SACD from the same mastering it means it was converted to digital, unless they roll the tapes yet again. If the 45's are "true" they are analogue. Sad facts about marketing options are why I bitch about these "boutique" issues. Why stress an original source for small returns.
BUT it seems to take something like this situation to alert "the master" that Dolby A tapes are not originals.