Those things stink. They're even worse than crimp splices.
If those wires had been soldered and correctly insulated they'd last forever.
I've heard all kinds of stories about how soldered connections get brittle or weak on vehicles. But all the ones I've ever come across while helping folks by the roadside are either crimp splices poorly made, wire nuts, or just twist-n-tape connections.
Never seen a soldered splice be bad in the field. Just all the other kinds.
Jim