I think some are getting confused between the INMARSAT link and ACARS... there isn't one, except if you pay for a certain service the SAT link will carry ACARS data.
REMEMBER folks the SAT transceivers on the aircraft are also voice capable, and the pings are used as a "stay-alive" status at the SAT-end of this link. In other words if the crew decided to make a SATCOM voice call, the satellite needs to be ready to relay the message.
What he's inferring I believe is that the last ACARS transmission DID include precise positional info, so the 1.11 SATCOM ping will closely correlate with the 1.07 ACARS report, and from thence the following pings can be traced/located (at least to ping arcs).