Yes is the answer.
You get 2 IPP for each territory regardless of how many you control. You dont need all of them.
So if you only held the Philippines then you would only get +2 IPP. If you held Java, Borneo, and the Philippines, you would receive +6 IPPs.
The same is the case for the +1 Territories in China and the +1 For Wake, Midway, and Solomons.
If you hold a listed territory, and are at war with a major power (barring Eveolved China), then you will get the IPP bonus for that territory .