I will repeat myself here: I tried to use my XCI games online on two different Switch consoles I had: no nsps, nothing installed besides SX OS and I was only loading the game but still got banned after 2 weeks. It was in September 2020.
On the other console I had I tried to be more careful and I loaded the XCI games offline(airplane mode) with stealth mode on SX OS and only went online later, after rebooting, with the original sysMMC to update my play time on these games and upload my saves - but I was banned too 3 weeks later.
After I got banned, I immediately sold both of the consoles because banned consoles are worthless for me. Somebody else can have these two crap devices but I won't be banned on any of my consoles.
That's when I gave up on CFW.
You can believe me or not but I will say this: Do not use SX OS to play XCI's online. It will get you banned, I can certainly guarantee that.
SX OS is horrible, honestly. I still wish someone will bring a xci loader for atmosphere.