Oh yes you can. The Indonesians themselves claimed the 8.9 megaquake was initially of M 6.8.
This quake doesn't appear anywhere on the NEIC or Swiss Red Puma lists. It never happened.
The US agencies say these quakes are initially a wrong number.
Intensity is determined by examining the seismograph readouts. You do not instantly "know" an intensity.
You are very, very wrong.