He might not be:
Although the Reconstructionist movement officially supports liberal Zionism, it also has a disproportionate number of anti-Zionist members. Of the Jewish Voice for Peace rabbinical council, about 60 percent of their members were trained at the Reconstructionist Rabbinical College.
Wikipedia cites this: https://jewishcurrents.org/a-reconstructionist-reckoning It's about the increasing tension between the RRC and its non- or anti-Zionist students