Yep. There is hard science that would counter any supposition that wants to claim lower than absolute zero for a temperature. This is just one example where science places limits on the physical universe.It never crossed my mind to ask about temperatures below absolute zero. My science tells me that this corresponds to zero motion = zero energy. That is why you cannot reach it since it would require heat transfer from another object of temperature below that condition.
Your "absolute" thread is helpful to reveal some of this, btw.