Despite this mere mortal never having flown the super equipment that Centarus is telling us that he has, and despite his clear disdain for this possibility, I would have thought the acceleration of a C210 with only two on board would have been conceivably sufficient to trigger this illusion.
The "super equipment" quip is a bit unfair. Nowhere in Centaurus comments warranted such sarcasm. However, in numerous Australian general aviation accident reports, where, in the absence of any evidence of technical malfunction that was the cause of an accident, the possibly contributory cause of somatogravic illusion is invariably mentioned. In other words it is a catch-all fall-back reason for an accident but without a shred of hard proof.
If, presuming all pilots - including airline pilots - are subject to such an insidious illusion at night or in IMC, then perhaps this warrants ATSB attention in the form of a survey to all licensed pilots to obtain hard data. That survey should include statements of aircraft type involved.