These scores were uploaded to the 3DMark database by Jason Evangelho aka TheGameTechnician, who is a marketing specialist at AMD's Radeon Technologies Group. As VideoCardz suggests, it will not get any more official than this before launch. It looks like the scores were accidentally submitted as they've already been deleted. Does AMD have another magic ace up its sleeve or was Frontier Edition indeed representative of RX Vega? Guess we'll find out within a couple of days.
The site also heard unverified rumors that Radeon RX Vega will launch on August 8th and that custom-design cards won't arrive until mid- to late August at best.