I was thinking of using this also maybe next week when me and my friends got some time for a flex raid. But it is new so I don't think many have done it.
I cleared gold as dps and also tried some endless mode. If you can clear gold I think you will also be able to raid properly in flex raids and even normal. It simply shows you got a brain and know how to use it. This will be a much better requirement than some ilvl requirement which doesn't prove anything other than that you are able to get carried in some farm group on timeless isle or simply got lucky.