Any electricians here mind telling me if this is unsafe?

Some backstory:
>Recall on window air-conditioning unit due to water retention/mold concerns
>In order to get your money back the company requires you to take a photo of the unit with the cord cut w/ serial number visible
>Dad thinks he's a genius, decides to get his money back and keep the unit anyway
>Cuts the GFCI cord
>Gets rid of seemingly important copper mesh and insulation around some of the wires since he "doesn't know why they do that"
>Splices the wires together using solder and wire splicers
>Bits of the copper mesh still hanging out
>Whole thing wrapped in electrical tape

I'm not paranoid in thinking this is a bad idea right?