I don’t see how it makes much difference. There must be relatively minor differences between the specific NexDock model that you ordered through Purism and the NexDock model that you are talking about here.
The core privacy threat is in the computer itself. A lapdock is “just” a keyboard, mouse and display. That is not to say that it is impossible for a compromise to originate in a lapdock.
The other aspect to consider is the wireless.
- On the one hand, anything wireless is inherently more suspect when it comes to security and privacy.
- On the other hand, will the NexDock even work wirelessly with the Librem 5? (either charging or data)
So, at a minimum, you would want to be able to disable the wireless functionality in the NexDock i.e. disable in ‘software’ presumably using some kind of on-screen display. I would be asking the vendor whether it is possible to turn wireless off.