Unfortunately the answer is going to be the same. Your Macbook may have an HDMI port, but it's an HDMI Output, not Input. You don't have any direct access to the monitor itself.
This is the way laptops (and iMacs) are designed. The monitor is connected internally, so you as the user don't have access to its inputs. The HDMI port you mentioned is for multi-monitor setups - it is an HDMI Out. That is, the computer can send a signal out through that port to another monitor. It can't take an incoming signal and transfer it to the laptop monitor.