Note that any disassembly really ought to be suggested by Fairphone if the phone is still within the warranty period. The note to remove the metal screen would never be suggested by Fairphone, that is clearly an out of warranty personal issue.
Regarding the bending of the spring contacts on the screen:
Worth noting is that they contact to a ‘solder’ square which can become tarnished and have poor conductivity. Just removing the screen and replacing may not align the clean previous positions of contact so cleaning the ‘squares’ is an idea before replacing the screen ~ shine them up a bit 