I do think the argument makes sense because casual listeners - including those who may want a cheaper 2nd hand Mac Pro - get the impression the depreciation was massive, from 42k to 4.7k.You're really, really reaching there, and ultimately your argument makes no sense.
It's not as if he sold it to an individual for $4700. He got the standard buy back amount for it. Lots of people do this already. Apple will still charge end users the same refurb prices it would normal charge.
BTW, I am not optimistic for pricing on the used Intel Mac Pros once the Apple Silicon Mac Pro drops. I suspect the last Intel Mac Pro will drop in value quicker than is usual for the Mac Pro.
Yes, there is that core group of Mac Pro users who will need to stick with Intel for their workflows, but there will be a much bigger group of users who will flock to the Mac Studio instead, and of course, another smaller group that will flock to the Apple Silicon Mac Pro.
It's not true and various comments on that podcast say exactly what I am saying - so him talking about it is tone deaf imo, unless he's not giving us all of the information and details.
But anyway, I agree there will be and is currently a lot of depreciation, which ultimately makes it a tougher sell. Most people aren't lining up to buy these, if they ever were.
But it still has tremendous use for many, and the trade in price he quoted is vastly under the actual 2nd hand sell price if the specs he mentioned are accurate.
If he brought the machine down to near base specs and removed the expensive bits, it would make more sense, but he did not mention this.