Fallowing models can use this methods to remove back bottom case:
13 / 15 / 16 inch macbook pro 2016, 2017, 2018, 2019, 2020, 2021 Model.
Answer: After removing all p5 screws, slide in between a plastic pray tool or a plastic card ( lower section of the bottom case ) than raise the bottom case order about 1 inch and next slid your singer and pull upwards about 3 inch and you should hear two snap sound indicating now you can slid and pull the bottom case toward your self. is tricky but easy.. its not by force so take your time. make sure when your removing the bottom case the laptop is lay flat and the bottom case is facing you, the serial number must be in the up side when your removing the bottom case.
1: remove t5 screws
2: slid pray tool to make space and raise 1 inch ( lower side ) opposite from the serial number
3: slide your fingers to get a good grip, elevate the bottom case about 3inch
4: once you heard/felt the bottom case snapped out, now pull the case tower your self to remove the case.
make sure not to damage the logic board by a sudden move of the bottom case when you’r pulling tower your self and when its coming out of place.
good luck. do some research if you’r not sure.