First, there's a continuum here, with perpetual motion and crystals on one end, and "bacteria cause ulcers" on the other. We aren't required to toss out all judgment just because some bits of the line may be true. I myself have some beliefs that I would currently put around "bacteria cause ulcers" on the line, but that doesn't mean I have to believe in crystal healing.
Second, this is not a scientific forum. It's an educational one. It is not particularly obligated to give equal airing to any ideas. The ones in the "bacteria cause cancer" area can make for very interesting talks, especially if the presenter passes the test mentioned in the article (secure enough to acknowledge doubts), but if they choose to close the door on those so they can avoid crystal healing, that's a fine and valid choice.
Agreed, and I'd go further than you in saying that TEDx has a duty not to try to lead scientific discussion or research by presenting cutting edge information. They rightly identify that they have a role as a credible purveyor of science, but lack the domain expertise to do more than popularize the scientific consensus.
Which is fine: If they do nothing more than make the current consensus more easily available to everyone, that's a worthwhile activity in itself.
Second, this is not a scientific forum. It's an educational one. It is not particularly obligated to give equal airing to any ideas. The ones in the "bacteria cause cancer" area can make for very interesting talks, especially if the presenter passes the test mentioned in the article (secure enough to acknowledge doubts), but if they choose to close the door on those so they can avoid crystal healing, that's a fine and valid choice.