You are right but this is about the Apple GPU (Graphics) embedded in the M1 rather than the CPU. There is no existing driver for this Apple GPU (for doing "accelerated" 2D/3D graphics)

There's more to a computer than just the CPU ISA.

While this particular thread is about the GPU, there is indeed "something different" about the M1 otherwise too. It is quite the non-standard SoC: unlike basically everything else (other than early Broadcom RPi crap) it even uses a custom Apple interrupt controller instead of the ARM GICv2/3. Also a custom IOMMU "DART" and a bunch of other peripherals. Very unusual: NVMe exposed as a plain hardcoded MMIO device (not enumerated over PCIe).