Ok so for anyone who has the same problem as me, apparently, with the new arm-based iOS simulator being bundled with the new Xcode beta (beta 3), you need to enable Build Active Architecture Only so that it doesn't try to build your app for the arm-based simulator on Intel-based Macs.
I guess this may also apply to arm-based Macs trying to compile to the x86_64 based simulator.
Semiak
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