There’s something about the specification of “those who already own Stray digitally on Switch 1” that leads us (and many others, looking at the comments) to wonder if physical S1 owners will also get the upgrade for free. The publisher has remained silent in response to questions on this topic online,

I have the physical version too and this would be a real shame and error on them if they didn’t give the free update for those who have the physical copy too.