So … was the client / server version that supported Mac archived and released as per the other quoted post from Mr Braben …
No, Mac OS users are able to continue to use their existing account using windows (native on a PC or via bootcamp as the post I linked to states). I understand the frustration about not being able to play natively but the servers are still up (obviously) and the account can still be accessed via a different OS.
If Console support were similarly shelved those accounts could potentially be transferred by FDev to a PC account but while many Mac owners have hardware capable of meeting the minimum requirements and perhaps already have bootcamp (it's useful to have Windows installed for lots of other reasons), I can imagine many console players may not have a suitably beefy PC to play ED on, particularly Odyssey.
The archiving & releasing process would be relevant to a situation where FDev switched off the game servers & ED was turned into a standalone game or one that linked to community funded servers.