Question About Power Supply Fix

Hello all,
I just watched an older YouTube video where Steve fixed a PS4 that constantly turned on for half a second and then turns off again.
After taking it apart and removing a small hatch and adding washers to the screws and replacing it, he mentions that if your PS4 does the quick on/off thing but that in order to repeat the process, you have to unplug then replug it to power, that the issue is instead a bad power unit.
That’s what mine does, but I’m lost as to whether I still need to do the thing with the washers, as Steve waited until then to mention the part about needing to replug it.
Any help will be greatly appreciated.
Thanks and have a great day!!!