Originally Posted by
overthewing
If you read his theory carefully, he says ' It’s plausible that a fuselage section near the SATCOM antenna adapter failed, disabling satellite based - GPS, ACARS, and ADS-B/C - communications, and leading to a slow decompression that left all occupants unconscious.'
ADS-B/C = transponder, I think?
A good theory. However, the ADS-B and SSR transponder antennae are not in the SATCOM mount and are duplicated on the top and bottom of the aircraft. So it is unlikely that a corrosion/crack in the SATCOM antenna and decompression would lead to a loss of SSR (which will be what the ATC were tracking) or to loss of ADS-B. It is possible that there could be a common mode electrical failure but that is doubtful.
The aircraft also underwent an extended maintenance ~ 2 weeks ago at which corrosion/cracking around the SATCOM mount should/would have been checked for.