The Malaysian CAA hasn't released the content of the data stream and I seriously doubt it is relevant. there will have been all of the normal messages and then the 1:07 packet will all most surely be a top of climb report or a routine monitoring report. But the CAA has declared that it was received, they declare it was received via satcom and Inmarsat logs show a set of data packets at exactly the same time.
The ACARS data is irrelevant, I am not in any way suggesting there is data post the 1:20ish loss of comms and transponder. The relevant point is, the earlier statements in the thread that MAS did not use Satcom for their ACARS are clearly not correct. It may well be true that MAS did not subscribe to RR or Boeing monitoring service - but that is irrelevant to the loss of this aircraft.