Assuming his posek is working within the framework of Orthodox Judaism, yet holds of the Eruv. Why cant that person carry?
I was once in Monsey for Shabbos and the people I was with were pushing a stroller and they held by the greater Monsey eruv. We passed by a Viznitz area and they were yelling at us H’Eruv G’Broken . It seems their eruv in their local area was down and did not hold by the greater Monsey Eruv