The problem isn't that you asserted something about MWI -- I'm not discussing the MWI itself here.
It's rather that you defended something before you knew what it was that you were defending, and attacked people on their knowledge of the facts before you knew what the facts actually were.
Then once you got more informed about it, you immediately changed the form of the defense while maintaining the same judgment. (Previously it was "Bad critics who falsely claim Eliezer has judged MWI to be correct" now it's "Bad critics who correctly claim Eliezer has judged MWI to be correct, but they badly don't share that conclusion")
This all is evidence (not proof, mind you) of strong bias.
Ofcourse you may have legitimately changed your mind about MWI, and legimitately moved from a wrongful criticism of the critics on their knowledge of facts to a rightful criticism of their judgment.
I'm not sure about the details of your comment. I just changed my comment regarding the claim that there are testable predictions regarding MWI (although there are people on LW and elsewhere who claim this to be the case). As people started challenging me on that point I just retreated to not get into a discussion I can't possible participate in. I did not change my mind about MWI in general. I just shortened my argument from MWI making testable predictions and being correct irrespective of testable predictions to the latter. That is, MWI is an implication...
If you know more Eliezer Yudkowsky facts, post them in the comments.