Probably. I think the most recent Pathfinder apps were built with Unity 5.4.3f1. Any patch release or major release newer should have the audio fix.
If you're wondering "Well, why haven't the devs upgraded their Unity?" the answer is mostly: "if it ain't broke, don't fix it." Unity generally recommends caution when updating your setup because the little changes here and there might bug out an app and require some testing to verify things are still ok.
But unfortunately is kinda "broken" for iPad 4 users, some at least. It's not a game-breaking bug that's true but is one that, at least for me, prevents me to spend more money in the game. Surely I'm a nobody in the eyes of the devs but if this problem is affecting more people (with the root of the bug being well known apparently) and they still do nothing after all this time... I think is very detrimental and, frankly, unprofessional.
I still have hope tough because I love this game.