Thanks for the reply. Yes, you were on the mark. This was a warning that if you are running on macOS Sonoma you must use the new API requestFullAccessToEvents(completion:) or you won't have access to Calendar database.
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I was also bitten by this problem. If this happens, it is like the OP said: you still have the VALID_ARCHS setting on your build settings. The trick is to scroll ALL THE WAY down to the user-defined build settings, because when this setting became deprecated it was moved down to the bottom of your build settings. Once you DELETE (yes, delete it with the delete button) this build setting, another option called My Mac will show up besides the My Mac (Rosetta) option and then you can build an Apple Silicon version of your Mac app. If you have more than one target, you need to repeat this for each target you have on your project.
Another thing I learned is that at least on Monterey if you do not include a PkgInfo file containing the text "BNDLhbwr" (without the quotes) inside your help bundle, Finder will not recognize it as such and it will continue to display it as a normal folder. I discovered this through trial and error using Xcode's PkgInfo as a starting point to force this.