I'm in support of removing delivered games from the list.

Official statement from kickstarter page:

Can you release “Elite: Dangerous” on the (iPhone/iPad/Console/Mac/Linux/Oculus Rift/Raspberry Pi) platform?

Yes. It would be great. The PC version comes first though, and then we will look at the demand for other platforms. If the game exceeds its target, then there will be scope to increase the number of platforms. We will discuss with the backers in the design discussion forum, and how to address the issues that will arise, but I have every hope that we will cover some or all of these platforms

While a Linux port was never explicitly promised, it was clearly implied.

1. Braben stated that the scope would be to increase the number of platforms if they exceeded their goal. They did not, in fact, they vastly exceeded their goal, but they're moving closer to a Windows-only style with the new expansion not available for Mac. So he broke his promise for that at least. Since he wanted to target PC platforms first, covering all of the above platforms requires covering Linux first.

2. Braben was considering mobile platforms and the Raspberry Pi, so he obviously wanted to cover as many places as possible, and covering the Pi requires covering Linux, since he wanted to target PC platforms first.

3. Braben co-developed the Raspberry Pi and called Linux the future.

And there have been no official mentions of Linux support since the kickstarter.

Maybe this doesn't deserve to go on the list due to a lack of any non-vague statements but it should be open for discussion.