Last night, on Youtube, I watched a video called "Joel Osteen exposed" or something similar. [Spirituality & Religion]

It was John McArther basically saying Joel's Prosperity theology is false. The video maker included a caption that said "John McArther is also a false prophet." I'm no fan of Osteen or "prosperity gospel preachers" in general. Nor would I list McArther among my favorite preachers, but I fail to see how McArther is a false prophet. Can someone tell me why McArther is a false prophet?