Of course the DEI territories are not neutral. The status of the Dutch territories is clearly defined in the Pacific rulebook, page 9:
“Dutch Territories
The Dutch territories begin the game uncontrolled by
any power. However, they are considered friendly to the
Allied powers. Holland has been captured by Germany, so
Dutch territories are treated in the same way as any Allied
territories whose capital is held by an enemy power (see
“Liberating a Territory,” page 20), with the exception of the
guardianship of United Kingdom and ANZAC (see “United
Kingdom and ANZAC”, above).”
The fact that a territory currently is uncontrolled does not make it neutral.