This is the same guy, not too long ago, that swayed public opinion from 3/8 to 1/2 and then back down to 7/16, and now its back to 3/8 and he's even suggesting 5/16.
Did you even READ the original post? He completely explained it. Heatercores and more primitive block designs benefited much more from the higher flow 1/2" tubing and we were using pond pumps. A maze 3, heatercore, and eheim 1250 setup was a completely different the researched and designed components you're buying off the shelf for the sole purpose of computer cooling.

Plus no one has ever even done thorough 1/2 vs 3/8 and smaller tests. How can you be claiming he's a sort of hypocrite when, up to this point, there was no thorough data of any kind comparing different tubing sizes other than 1/2" and 7/16".