It's obviously not new. ±400VDC architecture was presented at Open Compute last year, which is a fair indicator that the presenter had put it into practice at least 5 years prior to disclosing it. 48VDC distribution within a rack, and 48-to-1V direct regulators for CPUs, were both contributed to OCP 7 years ago, at which point they were both old hat. And 48VDC telco junk is, of course, totally ancient.