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Posting some info from the "About this Macbook" menu would be helpful. You can get more information about your installation by pressing the Apple Menu, then About This Mac. An official Apple guide can be found here: https://support.apple.com/en-us/HT203001
Thanks for the detailed report. I looked up the error code and it seems like Steam sometimes has trouble with game configurations on Mac after they change. You should be able to fix it by uninstalling the game, and if that does not work you can try removing all the game's files.
There's a few threads and blogs about this issue online. You probably only need the first one but if you want more details you can look at the other links as well.
https://steamcommunity.com/app/313120/discussions/10/3105775128765441019/#c3068621701748838807
https://forums.kleientertainment.com/klei-bug-tracker/oni/game-doesnt-start-on-osx-r26742/
https://appuals.com/error-4294956486-in-steam-windows-and-macos/
Let me know if that solves it for you! Sorry for the hassle.