PCIe lane count depends on CPU support, for AM4 I believe it ranges from 6x PCIe 3.0 (cheapest AMD Athlon/Ryzen CPU-s with integrated GPU) to 24 (PCIe 4.0 for latest Zen 2 based Ryzen 3000 series).
The CPU they list in the article supports 16 lanes of PCIe 3.0 connectivity + 4 lanes for chipset (storage and other IO). Nowhere near the 48 PCIe lanes you mention, although you could argue that 20+4 lanes of PCIe 4.0 bandwidth is equal to 48 lanes of PCIe 3.0 bandwidth, but this would require a compatible CPU, which would increase the cost by hundreds of dollars.
PCIe lane count depends on CPU support, for AM4 I believe it ranges from 6x PCIe 3.0 (cheapest AMD Athlon/Ryzen CPU-s with integrated GPU) to 24 (PCIe 4.0 for latest Zen 2 based Ryzen 3000 series).
The CPU they list in the article supports 16 lanes of PCIe 3.0 connectivity + 4 lanes for chipset (storage and other IO). Nowhere near the 48 PCIe lanes you mention, although you could argue that 20+4 lanes of PCIe 4.0 bandwidth is equal to 48 lanes of PCIe 3.0 bandwidth, but this would require a compatible CPU, which would increase the cost by hundreds of dollars.