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But then there would be no lanes for 10GbE+ networking right? I was going off the commercially available platforms such as https://www.dell.com/en-us/work/shop/povw/poweredge-r7415

Correct, you'd only get the chipset's IO. IIRC each 10Gb port would be 2 PCIe3 lanes (with some waste, you can run 100Gb on PCIe3x16).

corrected: 10GB -> 10Gbps, 100GB -> 100Gbps

You're completely right, fixed the suffix.