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This article specifically mentions "nonphone devices" which means it is not much (if at all) different from Signal desktop

• shawnz 5y ago
  But you can now use them even if the phone is turned off, unlike previously where the "web" devices just provided a view of data from the phone.
  • grandchild 5y ago
    The Signal desktop client has always continued to work even when the phone was off.
    • shawnz 5y ago
      Interesting, I wasn't aware that was supported. Thanks for the information
      • smichel17 5y ago
        Yeah, the implementation described in the article seems almost exactly how I understand Signal has been doing it all along. It's purely a client software choice not to allow a phone to be a secondary device. There's a fork which adds this feature to the Android app, though I forget what it's called.