Artevelde said "exercised sovereign control", not "owned."Artevelde -
Britain did not "own" Palestine - it exercised a mandate over it.
It did not colonise Palestine, it did not annex it, it did not incorporate it into Great Britain.
The mandates were never intended to be an act of colonisation - moreso of shepherding the states towards full statehood.
This is two points you are arguing where you seem to be performing the intellectual equivalent of Twister in order to hold an argument together that you are definitely smart enough to know doesn't actually hold water.