We need to pay attention to the Apple Neural Engine in this discussion, which is reportedly the same in a 2020 M1 MacBook Air as it is in a 2021 MacBook Pro with either M1 Max or M1 Pro - and the neural engine is what PL uses for Deep Prime exporting. The M1 Max and M1 Pro will be faster than the M1 at many things, but not necessarily exporting from PL.
Later: Here’s the DxO staff post I was recalling as I wrote this: 16 Months Later: Still No Universal App for Apple Silicon - #36 by StevenL