Does this aluminium plate have a hole at this point?
This is because the interface would otherwise not be accessible from the outside with the plateamp you have shown here:
There are also pins instead of simple solder joints. Could you say a bit about this?
No, this aluminum plate does not have holes on the bottom of the PCB to access the programming port on the bottom of the PCB.
If you need to install a printed circuit board on the plate you specified, you need to unsolder the pins from the top side of the printed circuit board, clean the holes with a syringe needle, and solder the pins from the back side, the same needs to be done with the LED.
If you know for sure when ordering that you will use the board on such a plate, I can immediately turn the programming port in the direction you need.