You can already use RePitch in ARA mode in Logic Pro 10.7.3 or later on Apple Silicon macs,
but you need to open Logic Pro using Rosetta.
Native Apple silicon support for ARA plugins in Logic Pro on M-Series requires Apple to rectify certain issues in future versions of macOS and Logic Pro.
Resolving these issues is in the hands of Apple.
We hope this will be as soon as possible, of course, but only Apple may have an idea of the timeline.
Note that this only affects Logic Pro and the Audio Units version of RePitch at the moment. Other ARA-capable DAWs can run the RePitch VST3/ARA plugin natively.
We do appreciate your patience!