Well, um, two questions:
- Would this work at all on the Librem 5? (May need both support within the operating system and support within the WiFi card. Would have to study the available modes of the WiFi card.)
- Assuming it does work at all, can the Librem 5 simultaneously communicate with the lapdock for its display (and keyboard and mouse) and with the local Wireless Access Point for networking? Apparently this is an optional feature, so it may not be available. (If it isn’t then this need not be fatal for all use cases - because the Librem 5 can still access the internet via the cellular modem - but for some use cases this would be a major problem.)
You would certainly want to ask some questions about security in this scenario (wireless display). However probably not worth asking unless someone finds that it works at all.
As far as power goes, this is a trade-off i.e. the Librem 5 then can’t be charged by the lapdock - but the USB-C port is free for another power source if one is available. Based on the discussion here: UPERFECT X Mini lapdock works with Librem 5 even without another power source for the Librem 5, the lack of charging for the Librem 5 may not be a major problem - but that doesn’t take into account the energy used in pumping the WiFi hard (minus the energy used in pumping the USB-C hard). You probably aren’t going to get a whole day out of it - so you would need a power bank (or spare battery) for the Librem 5.