"NATO Restricted" is the lowest-tier of NATO classification. It does not require security clearance to access, and mostly exists to prevent the leaking of information.
Commercial products don't generally go from unclass to TS/SCI in one jump. We should anticipate this isn't the end, given how these types of contracts are generally structured.
Presumably most NATO personnel will have a significant amount of data at higher restriction levels, arguably making these devices of little use to them.
It's a pain using a device that you can load some data, but not other.