I find it funny that people say "only" for a setup of 64GB RAM and 8GB VRAM. That's a LOT. I'd have to spend thousands to get that setup.
The Steam hardware survey puts ~5% of people with 64GB RAM or more
$1599 - $1999 isn't really a crazy amount to spend. These are preorder, so I'll give you that this isn't an option just yet.
DIY.
Can be had for under US$1000 new https://pcpartpicker.com/list/WnDzTM. Used would be even less (and perhaps better, especially the GPU).
These are prices for new hardware, you can do better on eBay
you don't need a desktop, or an array of H100
they don't mean you can afford it, so just move on if its not for your budgeting priorities, or entire socioeconomic class, or your side of the world