Your quote deals with the ESTABLISHMENT of authority, which is (indeed) part of the definition of an occupation. There can be no question whatsoever that IDF authority over Gaza was ESTABLISHED in 1967. Now, SDHD, go back and read the Law Reports of the Nuremberg Trials and you'll see that the List case is perfectly apt i.e. the question in the Hostages Trial was wether List's deployment of troops OUT of an area meant the end of his authority. The answer was "no" EVEN IF the deployment of troops OUT of that area created anarchy in its wake. The test was not "boots on the ground" but that of "effective control" i.e. wether List could have ordered his troops back IN to restore order. Barak retains that same authority i.e. he could order the IDF back into Gaza tomorrow to restore order. That AUTHORITY (and Israel *does* insist that it has that authority) shows that the IDF is still the occupying power.
Jerusalem suburb of Even Sapir evacuated as wildfire spreads (Haaretz)
from the article: Four Gaza factions halt rocket fire, in bow to Hamas