That may be an overpriced $52,000-53,000 Apple Mac Pro computer but is has an 28-core Intel Xeon W processor (that looks to be the $8198.00 Xeon W-3275M launched in 2019), 1.5 TB of DDR4 ECC memory (that is 12 DIMMS of 128 GB each), 8 TB of SSD storage and 2 Radeon Pro W6800X Duo with 64 GB of VRAM (each costing $5,000 now so a total of $10,000). The PC you have listed is not exactly comparable "apples-to-apples" to the Apple Mac Pro (Threadrippe 3990X that seem to be anything from 5.365 € to 6664 € depending on the country) and a RTX 4090, starting at $1600, is a gaming card with "only" 24 GB VRAM. A more comparable graphics card to a 64GB Radeon Pro W6800X Duo from 2021 would be a $4,650 NVIDIA 48GB RTX A6000.I love how it costs more than 3x as much as better PCs. You can get a SLI dual 4090, threadripper 3990, 16TB storage, 256gb RAM pc for around 15-17k. This, by the way, is far more powerful than a mac pro. But with the fantastic apple tax, now you can add the price of a decent car to your computer before buying it. But be careful, since once you buy it, it is automatically worth below 1000.
In short: Apple fanboys will love it