My PS4 also has 2 metal rings around each screw hole and 4 metal pieces 2 on each side closing in the same shape as the pressure plate as you take the pressure plate off?

The screw located to the far left in the picture above is in a different place in my PS4. In mine it is located in the hole at the very top right hand corner of the fan right next the the black plastic post that secures it in place. The other screw is located in the same position as shown above.

This is the 2nd PS4 I have disassembled and on both units I have found there is a black Phillips screw securing the upper EMI shield. This should be mentioned in the teardown as the EMI shield cannot be removed completely without first removing this screw and you risk damaging the EMI shield in the process . To locate the screw turn the unit over and you will see a small black Phillips screw located near the power supply prongs. There will be a set of arrows pointing to the screw. Once you remove this screw then you can fully release the upper EMI shield.

I actually find that using your fingernail works brilliantly. just place your nail under the connector where you will feel a slight lip. this lets you know that you have just the connector and nothing else. then just pull up slightly and the connector pops off. Worked a treat for me first time and this is my 3rd SE i have opened now.