Cool - I hadn’t noticed that question yet but definitely worth asking to be sure, especially if teams were prohibited from using devices at the field altogether at worlds this year (I can attest this wasn’t an issue in Engineering, but something may have come up in another HS division). <G7> seems pretty clear that using devices during a match is fine as long as communication features are turned off.
The nuances of <G7> haven’t been that important in previous games. There wasn’t much incentive to use computer strategy aids because it’s usually pretty easy to tell what you need to do. So some refs may have simplified <G7> to “no devices at the field”, which isn’t correct but is much easier to enforce than the actual rule. Teams, in turn, may have been less likely to fight refs on that point because there wasn’t much advantage to be gained by using devices field-side.
This year, the big potential advantage associated with using a <G7>-compliant device during a match means that refs and teams will have to be extra careful about enforcing and complying with the rule exactly as written.