Lazy posters...
If you want to keep posting the same questions over and over, then this is going nowhere fast... how about you READ the THREAD before posting questions that have been answered over and over and over and over....
1) Rig worker - was 370 miles from the last reported position... you figure out where that puts the horizon even accounting for the aircraft being at 35Kft.... Also the fact that nothing more from the alleged source makes this even less believable.
2) Pings... The SATCOM sub-system is entirely SEPARATE from the ACARS system. The SATCOM terminal is simply one of the available transmission systems fitted to the aircraft. Just as the voice transmissions can be sent via HF, VHF, or SAT, so can ACARS messages. Therefore the act of deselecting ACARS does nothing the SATCOM transceiver itself. The INMARSAT system is effectively maintaining a "stay-alive" connection to the aircraft. The fact that the ACARS system was not subscribed to the SATCOM service isn't really relevant.