I do not believe it and you should not either
It's the same thing all these people would tell you about the files we've been checking, "They're actual dumps from live boards" They may be, but they are dumps from a board where someone programmed in stock BIOS upgrade not complete BIOS, then dumps, which is same as not programming/dumping, pointless and is not a complete dump.
All BIOS solder pre-programmed on ebay are same way, using this same type of file (and same confusion of it being programmed with an actual dump). I am very familiar with that stuff on ebay, they can't sell BIOS from actual dump anyway, if they did all users would end up with the dumps serial, UUID, MAC ID ect (Instead of blank/generic/FF/00 which is what you'll get from that type of BIOS replacement)
You'll have to find other users with same, on forums, or facebook type places maybe. Or maybe you can find a dead/part/as-is cheap on ebay, probably cheaper to try and find dead motherboard than complete system, but you may find either cheap if you look often.
Or, you may be able to get Asus to send you full SPI Image, ask them via email, tell them you replaced dead BIOS chip and need full SPI Image and that you can put in your own system details but you need complete BIOS Image and not partial BIOS update that's provided on normal BIOS download page.