Broken screw can't be unscrewed from the PS4?

I have a broken screw on the power supply unit and unfortunately can't screw it out. I've tried this rubber trick, but it didn't work.

PS: Do this because I have to put new thermal paste on the PS4 or it will overheat

I'm not a handyman (and a poor handyman), but I know there are a number of tricks. The rubber trick you already tried is certainly one of the simpler. I would also try again to apply something to the screw head, which increases the friction with the screwdriver. Maybe a dab of glue or something similar.

If all else fails, you can mill two notches for a Phillips screwdriver or, as a last resort, drill into the middle of the screw and then unscrew it using a suitable tool.

Please: Everything at your own risk. Just watch ten YouTube videos and copy what seems best.