I don't understand what's wrong with Screamscape.. or Jim Hill for that matter. They seem to report on what is universally known without pulling things out of the blue. I've noticed things like the Monsters Inc coaster not panning out, but something like that can't be held against them.. I was also going through their archives recently, out of interest, and noticed they announced the Seven Dwarfs mine train in say 2008, quite awhile before the specifics of FLE was even announced. Website has its moments.
You kind of answered your own question -- they have their moments because they are not particularly discerning with the rumors they share. Anything that is being passed around as rumor, verifiable or otherwise, is good enough for them to report. Every now and then a story they shared turns out to be true, but even a broken clock is right twice a day. Cover enough rumors and eventually some of them will turn out to have been legitimate plans.
With regards to the "insiders" on this site -- and there are a few of them -- the real ones have a track record that is proven over years of solid reporting. When a new rumor is shared, look to see how the senior posters respond - if they're inclined to believe the poster, it's probably because the majority of what that poster has shared over their time here has been solid info. If they jump to questioning, or the poster is brand new, there's cause to take their info with a grain of salt. Every now and then someone with solid info will share something that ends up not coming true, but plans
do change, and I can't imagine why anyone of repute would suddenly decide to stir the pot and just make things up. With the right people, it's actually more believable that the information evolved around them, but really only a few people here really deserve that much credit.
The trick is discovering who here has developed a solid reputation and who has not, and judging the info accordingly. Someone is right with regularity over an extended period of time, and every now and then something doesn't pan out? They still probably know what they're talking about. Someone is right once in a blue moon, and other posters frequently question the legitimacy of their discourse? Probably more of a broken clock brand of "insider".