This is odd…I literally am
In the business of making aluminum for auto parts, bare raw cast Al will oxidize/pit faster than machined/polished cast Al, but I doubt these are built w/ secondary cast alloys, I imagine they’re extruded or machined from billet- usually a 6xxx or 7xxx alloy, regardless neither would oxidize to that level in such short time even from seawater.
I think this has something to do w/ there being an electrical current passing through it & the combination of metals together - something wonky going on potentially….OR it’s just a string of “bad” metal that was used to make that part of the shock, chemistry or machining process off causing the metal to oxidize extremely fast
Lastly…I drive a 2020 but was looking @ gen3’s recently & test drove a few & guess what? The ones I saw on the lot in MA also had that oxidization on the shocks