Maybe Chaim understands the statement, or the intent behind it, as accepting homosexual behavior itself. Some of the signatories probably would like try to push towards this direction. But as a matter of principle I think what Raul said and I said is correct. There is no general cherem on sinners. I mean for individuals who know they engage in sinful behavior but they don't solicit other people to engage in it, and do not try to rewrite the the Torah so that it would approve of their sins. If that is the case I can't see why only homosexuals should be banished while for example philanderers, adulterers, or TV/radio reporters who work on shabbat shouldn't.