https://store.elitedangerous.com/ed-eula/
"5. Online/multiplayer Features and Functionality
This Game may allow services operated by Frontier and/or its affiliates or third parties authorised on their behalf to be accessed which allow users of the Game to enjoy certain on-line or multiplayer features and functionality associated with the Game (“Online Features”). These services and Online Features may, however, require payment of additional fees. In addition, access to and use of such services/Online Features and other goods or information made available as part of such services may be subject to completion of a registration process and acceptance of additional terms and conditions including, but not limited to, privacy policies governing the use and processing of personally identifiable information. Importantly, not all purchasers of this Game will be able to register or benefit from such services (including Online Features associated with the Game). These services and Online Features may not be available in your country, are not guaranteed to be available for any period of time (and may be subject to suspension or withdrawal at any time) and may, for example, be subject to age restrictions. An internet connection will be required to access Online Features. You are responsible for all internet and other connection charges associated with your access to and use of any Online Features."
The EULA agreement does not state that we never had "Offlline mode", it does state to access to "Online Features".
I think this has something to do with "Dynamic In-Game Advertising" they introduced a couple of months ago, since it does require you to be online for it to be able to update as per the EULA agreement.
"The Game may incorporate technology (which may be provided by Frontier or third party service providers engaged by Frontier (each a "Dynamic Advertising Provider")) which enables advertising to be uploaded into the Game on your PC, and changed while the Game is being played on-line. In order that the Dynamic Advertising Provider is able to direct advertising appropriate to your Game and geographic region, as well as to the correct location within the computer game, certain non-personally identifiable data and information may be retrieved and retained by the Dynamic Advertising Provider including your I.P. address, geographic location, in-game position, and information concerning the appearance of advertising visible during your gameplay (for example, the length of time an item of advertising was visible, the dimensions of the advertisements). In addition, the Dynamic Advertising Provider may assign a unique identification number which is stored on your PC and which is used to monitor and calculate the number of views of dynamic advertising during gameplay. None of the information collected for this purpose including the identification number can be used to identify you. "
Can be wrong though.