[Formulajones]

Not really, the exhaust valve is open at BDC after the compression stroke, so as the piston moves back up to TDC on the overlap stroke, all the exhaust is pushed out of the exhaust valve. The intake valve is closed at this point. The intake only begins to open near the top of TDC on the overlap stroke, after most all of the exhaust gasses have been pushed out through the exhaust port.

So as the piston passes TDC during overlap and starts back down, the idea is to have the intake valve open further (sooner) by advancing the camshaft to pull in that cooler charge on the way back to BDC before the compression stroke.