Considering DDR5 and (most likely) PCIe 5 are going to be mass market in 2021, I don't think this comes as much of a surprise. XMG is a manufacturer of ultra high end laptops, including the Apex 15 which uses a Ryzen 3950X and a B450 motherboard, and this was posted about that laptop a couple of weeks ago on their Reddit thread. This also backs up AMD's claim that Socket AM4 would be supported through 2020.
https://www.reddit.com/r/XMG_gg/comments/fsbsr0/megathread_xmg_apex_15_with_amd_ryzen_desktop_cpu/