I remember the Vox video about these reverbs (as much as I don't like Vox that much).
As for New Wave I've never been good with labels since I still struggle to recognise prog music lol.
On the other hand when I hear 90's FM guitar in Japanese musics from that era.
Genres can be difficult to define because they are not always 100% separated from each other due to many musicians experimenting with and fusing them together. Even some bands we think of as definitively part of one genre often aren't exactly that. (For example, everyone thinks of Nirvana as
the grunge band, but not everyone knows their style is a mix of grunge, punk, noise rock, and various alt rock influences. This is why they sound more like the Pixies or Sonic Youth than 100% grunge bands like Soundgarden.)
The main difference between new wave and synthpop is how reliant they are on the keyboard. Older new wave bands like Blondie, The Talking Heads, and Devo were much more reliant on conventional instruments, particularly because synthesizers were not popular yet. Synths didn't become a big thing until Tubeway Army (later renamed after the vocalist, Gary Numan) released their hit second single "Are Friends Electric?" (Their first single "Down at the Park", didn't do as good due to some rather shockingly explicit lyrics for the time.) So synths became popular enough that even some new wave bands switched to using them as their main instrument and became synthpop bands. (Just to name a few good ones, A Flock of Seagulls, Depeche Mode, and the Eurythmics.)
As for prog, it's basically classic rock with a classical structure. Think Emerson, Lake & Palmer, King Crimson, Genesis, Blue Öyster Cult, and Electric Light Orchestra. It differs from heavy metal in that it doesn't really use power chords much, if at all. There are exceptions, though; Led Zepplin straddles the line between prog and metal.