Now I may be massively over-estimating Tom's reasoning for putting some of these rumors out, but it always comes across on the higher profile ones where Disney is actually shooting back like those two and this one that it's almost a preventative strike that Tom is making. He knows these are in the early stages, but doesn't care because he doesn't want to see Moana in the Tiki Room, Toy Story in CBJ, a bar in ToT, and also doesn't want to see Hoop Dee Doo go away.
So by leaking early in the process, you create an uproar in the fanbase, causing Disney to actually have to say something on what very well may a project actually in the works. I think the hope is for the intense negative outcry basically ends up killing all these controversial projects that they report on.
Again, Tom probably isn't playing 3D chess and I just gave him/WDWNT way too much credit