Ancient Mixed Golems defense buff?

They changed it way before that.
They "fixed" the bug that made it not affect magic def - but broke the text and possibly the actual physical def too (did we ever determine whether they did or not?)

I don't believe so, and seeing how small the boost is it would be hard to determine wouldn't it? Its not like you could turn it off and on either. I guess a character that has lv100 abitions (which should be 10%) could test it by removing other PDR stuff and seeing how their damage changed.