I clicked on the link http://m.wol.jw.org/en/wol/d/r1/lp-e/2008411 and what you quoted is not what they wrote.
They are not backing off the Global Flood idea.
And, there is no "Official JW Facebook" page. They are warning people right and left about the dangers, so I can't imagine under what circumstance they would have such a page.
bafh