Of course in light of the circumstances on that day, the officials saw it differently. Somehow I don't think Rossi thought he'd gain an advantage so consequently planned to hit the dirt at the corkscrew. The rules are in place for circuits that have unique TARMAC run-off characteristics which can short-cut the intended racetrack-ie Monza, San Marino, Catalunya, when a rider takes the run-off-they are expected to re-join the racing circuit with no place advantage gained.
A meter on to the dirt at the apex certainly doesn't constitute a short cut in Road racing, and Rossi had already made the pass, not gained a place or advantage from the excursion- if anything he certainly lost ground, so no action was taken.
If Rossi were to be Punished for leaving the circuit then not relinquishing a place on that day, then Stoner should have been too.......