The weight-on-wheels switch reports its in-the-air status over ADSB. It errs in the direction of assuming in-the-air, which was implicated in a near miss on the ground in 2020 between two Air Canada flights[1][2]

1: https://www.tsb.gc.ca/eng/rapports-reports/aviation/2020/A20...

2: https://www.youtube.com/watch?v=nj7nG6gJqsU

Not necessarily. All this could be reported up to airline HQ through the satellite link and then the IFE/customer WiFi could be downloading it again to serve locally.

That would prevent any need for direct connection between the systems.

Is that how it works? I doubt it. But it could be done.