ARMv8A and ARMv8R can both be pure 32 bit as well, incidentally -- e.g. Cortex-A32 and Cortex-R52. v8A added 64 bit, but it didn't take away 32 bit. It's not until v9A that 32 bit at the OS level was removed, and even there it's still allowed to implement 32 bit support for userspace.