Apple (and NeXT before them) was able to compile "fat" (multi-architecture) app binaries since the 1990s. The original NeXT machines had Motorola 68030 and later 68040 processors; OpenSTEP also ran on Sparc and Intel and I think PA-RISC also, of course then PPC, and then Intel again --- they've had architecture independence in their frameworks for a LONG time.