Same situation as jeb605 - my watch battery swelled and popped the screen off. Fortunately the force touch sensor did not debond from the watch. Thinking about just cleaning the back side of the screen and applying new adhesive. I used an alternate kit that did not come with the force touch sensor.

If the display is erratic, you may only have to replace the rubber conductors. Cleaning them may be good enough

It not just the power supply. The amplifier board is attached to the top.

The comment about “for original samsung chargers” should be closer to the top as this step instructions are wrong.