These are absolutely just low-bin EPYC chips. EPYC has never had "consumer-available" motherboards (read: you can buy them, just have to know where to look), no

These are absolutely just low-bin EPYC chips. EPYC has never had "consumer-available" motherboards (read: you can buy them, just have to know where to look), nor have some of the chips been officially validated for Windows 10 (read: it works fine). But the 2TB of 8-channel memory and 128 PCI-E lanes screams EPYC. Unclear what the price differential will be, but consumers can buy EPYC chips just fine, so if you want something home-built, that's a path. The main issue is finding a good motherboard; going Xeon-at-home is pretty straightforward, but EPYC boards tend to be really basic server-grade stuff designed for a datacenter.