I find that incredible hard to believe, the only way that would work is if AMD stock is near non-existent.It came from someone here who talked to retailers in Europe or those retailers released numbers publicly if I remember correctly, also Newegg reviews show the same thing, unless AMD buyers don't like to review their products, each nV performance cards are outselling the rx480 by more than x4, just the 1080 reviews alone are x4 of the rx480 as is the gtx 1070 review numbers.
Seems more likely that someone looked at previous quarter market share and just applied market share percentage to total sales of the new cards.