Yes that's true. ( in fact it is a part of the code that i exposed). But the main diference is that with your code you get a translucent window with translucent objects.
With my code you can get a translucent window with objects that have a diferent translucency that the window.
try replace the line 63 of my code with:
background(0,0,255,0);
if you do this you can see what's the diference.