>>531896216
Logic dictates that if you want to play any Switch game online, you will need to use Nintendo's infrastructure, which you're wholly bypassing while emulating. If any emulator supports online play--as you and others have alluded to, it's either from a LAN standpoint, or you and whomever, need to setup a VLAN with software like Hamachi (assuming they're still kicking around).
Bottomline, you can't have your cake and eat it too, not unless you're willing to come up with your own recipe and bake it from scratch.
Mind, this is all conjecture--I'm not entirely familiar with that particular emulator. Much of this is from past experience.