I'm a member of scientific organizations that have issued statements with which I don't agree. Does that make me biased?
There could be a perception by somebody who doesn't know you that you could be biased. If you were a judge in a case involving an issue dealt with by one of those scientific organizations, it would be reasonable for one of the parties to bring that up in a motion to ask for your recusal.
Another simple type of analogy: if you were a government contracting officer and held shares of Northrop Grumman as part of a retirement fund, would it be reasonable for you to be recused in evaluating a contract where NG was a bidder? Of course not. Having that happen is not damning you as being hopelessly biased, it is merely a statement that there could potentially be a conflict.
Judges should be held to just as high, if not an even higher standard.
(And so nobody confuses me for a Trump apologist, let me repeat: Trump didn't bring up the issue of conflict of interest, he brought up the person's ethnicity as the basis for bias. The former is reasonable. The latter is racist)