OK, had always been until the 90s, and then it was a mistake that wasn't correct by either definition, and only applied to one type of storage not the other types or storage or any forms of non-storage-based data communication. The cock-up this is the naming of 1.44Mb disks (and “720Kb”, and “360Kb” ones before them) doesn't alter that other storage media (hard drives, CD, …) were not counted in what would later be attempted to be disambiguated as MiB.

Even then it was only the marketing portion of the storage industry playing that game, when not talking to the general public floppy disks were referred to by their maximum rated information carrying capacity, 2Mbyte, not their OS-formatted capacity at all.