Switch Game Share and Legends Z-A

Hello, my partner and I are pokemon fans and usually buy the counterparts for each gen, with Z-A being the same as Arceus, we would like to both play but felt it would be a bit of a waste to pay for the (exact) same game twice just to play at the same time.

I've read online you can play the same digital game on two consoles so long as one is in airplane mode/both don't engage in online stuff at the same time.

Is this still true? And if so how can I get it to work, I have a Switch and he has a Switch Lite. My account is also on his switch and vice versa as we wanted to only pay for the Paldea DLC once.

Tl;dr is it still possible for a game to be purchased once and played on two different switches?

Thank you!