but the major problem is still corrosion of the Al. as soon as its cut Aluminium oxide (aluminium rust) forms on the surface. any press fit will still have the problem and add resistance to the loop.same with crimps .
Yep. Metal rusts, copper corrodes and aluminum oxidizes.
Something you can do after putting your pickup together is to spray/dab/dip/brush on some type of sealer to keep your connections clean. Sealer can be as simple as some paint or clear coat.
Dielectric Grease will work.