By the way, I'm using macOS Catalina, is the app 32-bit or maybe it's some sort of Catalina problem.
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From what I can find, the Mac deployment of RPG Maker games should be only available in 64 bit specifically because I believe Catalina can only run 64 bit applications, so it should be fine on that end. I'm assuming the link with general permissions issues tips didn't help? If you could let me know if that did anything and if you've ever played other RPG Maker MV games on your Mac, that would help me try and narrow down this issue. In the meantime, you could try manually downloading the latest nwjs for Mac's and putting that in the game. Here's a link. https://nwjs.io/downloads/