Yeah, I don't think that Arkane Austin and Arkane Lyon have collaborated on any game to any degree higher than maybe basic assistance during pre-launch crunch since the full co-development they did on Dishonored 1. If you look at their release schedule since 2012 there has been no overlap:
Arkane Lyon
- Dishonored 2
- Dishonored Death of the Outsider
- Wolfenstein Youngblood co-development with MachineGames
- Wolfenstein Cyberpilot co-development with MachineGames
- Deathloop
- Blade
Arkane Austin
- Prey
- Prey Mooncrash and Typhon Hunter expansions
- Redfall
- Unknown new game which recently began development (hopefully Dishonored 3)