Ahhh, according to Godot's official documentation:
"Godot 4's HTML5 exports currently cannot run on macOS and iOS due to upstream bugs with SharedArrayBuffer and WebGL 2.0. We recommend using macOS and iOS native export functionality instead, as it will also result in better performance."
Sorry ☹️, in hindsight I could've made downloadable builds for Windows and macOS as well, not sure if that would've been allowed lol, but also I don't have a mac to test with 🙃perhaps in the future though.