The 6k sales flyer from 2001 also says "A future software update
will enable support for 192kHz"

So we don't seem to be hardware limited on this. But this reminds me of another "abandonware" type of promise from Blackmagic regarding the Big Ursa's "upgradeable" turret. I won't get into that rabbit hole other that to say some promises just don't happen. I don't see why all legacy speakers couldn't handle 192, assuming they have the hardware grunt. But what that would take is not a topic for discussion here.

main room: 861v4, 2x6000L/R (24/96) 1x5500HC (24/96), 2x DSP33(Rears)
MS200/Roon, 598, Revox b710mkII tape deck, Revox b760 FM tuner, Revox b790 turntable
bedroom: 568.2mm, 3x5000(LCR) (24/96)