I don't think its wrong to try to repair that but the key is that it is deceptively easy to repair it and that most people don't know how it could be done safely (aka need to admit that its actually a hard repair )
but I am suspicious of someone uploading 2 blurry ass pictures, i.e. troll
how to solder it to answer the question no one cares about anymore, you need efficient heat sinks.
is the idea to throw it out and buy a new one good? its safe. but its also wasteful of resources.
i say wise man say its smart to throw that shit out
This was more to do with the OP, he lacks the ability to diagnose problems & repair stuff, he should not be taking repair jobs in from other people (if this wasn't his).
Also has bypassed the fuse (fire hazard) and is known to cut corners with cheap unsafe parts from aliexpress etc, that don't meet UK safety standards.
And remember this is a 240V appliance, with no earth/ground connection, any damage he does to the metal parts that the heaters are attached too & the insulation, would be a major shock hazard.
The thermal fuse did it's job as something else has failed, it could be the controller or the thermistor, replacing only the fuse would not fix it for very long.
Here is the last one I looked at (don't know what brand it was, picture from over 10 years ago), you should be able to see the mains cable is two core.
David