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]
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.
