Not so. Many Islamics who have multiple marriages visit this nation. They are not prosecuted for polygamy.
While there may be a conflict between the two statutes, the court found apriori that bigamy was a criminal offense, and addressed the issues on that basis. It said nothing about the legitimacy of polygamous marriages.
While i have no personal opinions on polygamy or gay marriage, or incestuous marriage if all parties are consenting adults, the provisions of English common law, which dictate in Meister deal with heterosexual monogamous marriage. It is still not a matter of statuatory law, rather, as Meister points out, common law.