Superbans did exist before, if you connected to the services while hacked you got banned, it only got elevated to a superban (or CDN ban) if you attempted to do something nefarious using Nintendo's CDN.
Previously, console bans have been split into normal bans and superbans.
People with normal bans could still use Nintendo's CDN, just not use the network services.
People with superbans could not use the CDN at all.
You had to do some fuckery...
I have no idea tbh. I followed the NH server guide when initially setting it up and I believe that there was something regarding exosphere.ini, but it did connect to the Nintendo CDN successfully on emuMMC upon the folder wipe.
Nintendo's console banning works in waves. When you connect to a Nintendo service, it sends telemetry data to Nintendo which is quite detailed. If something unusual, like an illegitimate NSP being installed, is detected, it sets a flag...
Yeah, that isn't a patched switch. I'm not skilled enough to install a modchip and while my friend does have soldering skills, they're only basic as of now.
Same reason as to why Luma3DS is the only realistically used CFW on 3DS - there's no need for another one.
The only case I recall when multiple different homebrew is used is Boot9strap vs Fastboot3DS, as Boot9strap is minimal while FB3DS lets...