Make sure to insert the tool right between the plastic cover and the steel cover. If you go too deep, you will pry the steel cover and bend it. The plastic cover is taped to the steel one with some low force glue.
(I had to do this step to replace the antenna flex cable)
I couldn’t pull this connector at all. Tried tip of spudger, flat end of spudger, my nail (which even got a dent in the process ^^) and finally the tweezers (I know, risky) but the little bastard wouldn’t come off…
I managed to pull out the logic board very carefully and twisted it in the least straining way for the cable to access the flex cable on the back.
In the end everything was fine and the repair worked ok.
Switching this step for this repair can be ok if you are extra carefull with twisting the cable