Oh, you mean the weird rainbow pattern. Sorry, in the community I scan for moire is colloquial for the inkjet dots that you have to apply light denoise to, so that was a misunderstanding on my part. I'm also not used to referring to the pixel resolution as ppi since manga scanlations get exported as 72DPI PNGs usually.
In any case, when I said "future-proofing", it's a real thing in scanlation because the early 2000s scanners basically didn't know what they were doing and were exporting 1024px JPGs that look awful nowadays. I'm used to scanning in 600dpi because of image editing. Finally, when I mentioned over-leveling, I don't normally do that. I just did that for the Game Critic books since they're printed on garbage paper and are mostly text, so I'm not really losing anything by leveling it a bit to get rid of the pulp (the photos of developers, etc. are dark and blurry anyway). Plus it's easier for ABBYY Finereader to OCR it if it's leveled. It's a case-by-case basis if you want to archive it.