I have no point in lying here. I'm just sharing my expirience.
I noticed that many people (my friends included) don't know that you can click on "Client hacks" in Poehud menu and make it red (which means "disabled"). My guess is that even If you click on all client hacks separately (maphack, zoomhack etc.), but leave "Client hacks" enabled, you'll get flagged.
I'm using old version, I always fully disable client hacks and I'm not flagged now.