Probably not if the Helium 5G offering is similar to their LoRaWan stuff.
Due to some security issues with the Helium LoRaWAN proof-of-coverage, only authorized hotspots/access points are allowed to participate. Helium manages this by issuing keys or certificates (IDK which it is) via the Decentralized Wireless Alliance[0].
I think it's highly unlikely Amazon would deploy Helium enabled 5G radios.