I wouldn't put TOO much stock into that. It's not outside the realm of the possible, but it flies in the face of a lot of heavy foreshadowing. GRRM may be brutal on his characters, but he's consistent with foreshadowing.
Though if any author would give a gigantic middle finger to fans who think they're slick, it's be GRRM. LMAO
"In April 2015, Martin reported that he hopes to finish the book by the end of 2015 and get it on the shelves before Season 6 of
Game of Thrones airs, which is expected to happen in April 2016."
http://www.ew.com/article/2015/04/03/george-rr-martin-winds-date