From MotoGP website -
New challenge as mandatory bike swaps added to Australian GP
Nope, no mention of a DQ but a very clear cut message that they MUST change bikes. He and his team failed to do as per the rule that was imposed and, like the vast majority of situations where a rule of fact is ignored, he got a DQ .......... just as Biaggi and others before him for failing to follow the process. It should also be remembered that all but two of the teams understood the intent of the rule and the ramifications which would seem to indicate that it was well understood by all others.
It does not have to be written when it is a rule of fact as it is called.
What you are failing to understand (recognise) is that the situations are entirely different and as such, they and the outcomes should be looked at in isolation and separate.
One was a fact ............ if you do not do this than you have breached a rule.
The second is a case of 'holy ...., did we just see that, man we need to look into that'.
As for Marquez and PI, well yes, he MAY have been able to continue but he and his team ignored a direction of race control ....... it is that simple and they have admitted it since - they ...... up.
With regards to DQ'ing VR immediately, once again your comment that he was enraged is based on what occurred after the event and what he stated after the event --- which RD did not have access to until after the race had been completed, thus they did not and could not KNOW (as opposed to assume) his state of mind.
One must remember that Marquez himself was only relegated to the back of a grid for what is one of the most heinous acts on a motorcycle racing circuit in the last 15 or so years, he was not dq'ed from the event just as more recent examples have been handled with kid gloves