LZW31-SN Dimmer Red Series (Gen 2), GE Aux switch, No Neutral wire: Aux can turn off but not on

Few quick questions that I didn’t really see answered here or elsewhere. I have a neutral in one box and not the other. The 2nd box looks really weird to my electrician. We know it was jury rigged as it is in a blue plastic box and all the other boxes are metal in conduit. He thinks it was wired from the light fixture. So I don’t know how that effects the wiring.

2nd Question is that I’ve seen people suggesting the GE 46199, which I ordered the other day, but it says it requires a neutral switch. Obviously the whole point of this thread is a no neutral situation, so I’m a little confused.

3rd Question is: I had bought an Inovelli Red dimmer assuming there would be a neutral in both places. I know this whole discussion is about non-neutral situations but my electrician warned me that attaching just a line and a ground could fry the switch sooner than otherwise. Is that correct? Is it safe to use a Red dimmer in both the line and load boxes.