True, but as I said above I don't think the sensor is the price difference here. Think of it like this: if they took the Z8 and were able to simply swap in a 24MP sensor, would the cost to produce that drop by $1000? I have a hard time thinking so.
I was responding to the claim (not yours) that "I feel like we're at a point where the argument for DX has nothing to do with price."
And I suggested that high end crop is significantly less expensive than high end FF, so to photographers who want a fast, action-oriented camera, there's still a significant price factor.
I'm not sure it's relevant how much of that is down to the cost of the sensor. I assume that beyond the actual sensor, there's a cost to processing twice as much data (45MP versus 24MP) at high speeds. Maybe a cost associated with the IBIS mechanism. Maybe other costs that aren't obvious, but anyway ... could Nikon create a FF D500 with a 24MP sensor at a similar price to a DX version? I don't know ... if so, then *maybe* that would answer the need for those users who want such a thing. But then you need to carry/buy longer lenses or crop down to 11MP. (Actually, Nikon makes this very interesting, now, with the 180-600 that costs less than the 100-400, or the compact 400/4.5 that takes TCs).