I would assume that majority of QNX deployments are on ARM these days and also ARM is the only platform supported by complete QNX "ecosystem" as some parts are

I would assume that majority of QNX deployments are on ARM these days and also ARM is the only platform supported by complete QNX "ecosystem" as some parts are not available for x86 (which is the only other currently supported platform). Wikipedia states that supported platforms historically were i386, PowerPC, MIPS, SuperH and ARM. And I would not be too surprised if there was support for Altera Nios-II with MMU in the times when QNX was owned by Harman (As at least the touch screen part of some versions of Harman made Audi MMI is based on NiosII).