Seems like a good price for 4TB with such high read/write speeds and PCIe 4.0 compatibility. Looks like a recent (considerable) price drop. There are not too many 4TB NVMe drives out yet, and the few that are seem to be more expensive and slower than this.
They also have one at $799, but it is 3rd generation and slower.
Serious question - what sort of computing environments need this much very high-speed storage?