Is my test correct to verify an ent_create memory leack?
From my point of view yes.
Is the F11 panel enough info to draw a conclusion on this or is there a better way to test this?
I don't see a better solution.
Is there any other info in the F11 panel I should be looking at?
No
Has the ent_create memory leack been fixed in any patch/version that I am not aware of?
Where did you get the information a bug like that even exists??
What are your experiences with this issue?
I don't see the issue at all. Your experiment pretty much proves that. ^^
What is the pps variable in the F11 panel's first column?
It's the number of triangles rendered per second afaik.