At this point, we should all treat Unity like we do Broadcom. Utterly toxic and should be avoided at all costs because they will shake you down and leave you with a lesser product for no reason other than blind greed.
Nothing Unity does will ever recover the goodwill they nuked for money
You get the ARM ISA, and compilers that work for ARM will compile to Apple Silicon. It's just that the actual hardware you get, is better than the base design, and therefore beats other ARM processors in benchmarks.