goldersgreener – you are being motzi shem ra against one of the greatest rabbonim in Europe, who was encouraged to build the NW London eruv by the Tzitz Eliezer (see his teshuvos 19:17).
The pirtza was measured and approved by R. Eider, and the traditional practice in many kehillos across the world was to make use of the same shiurim le’kula (NOT just the Chazon Ish’s but R. Moshe’s and R. Yaakov’s too), as cited in “The Laws of an Eruv” by Rabbis Francis and Glenner. Rav Elyashiv even wrote a clarificatory letter about this which you conveniently neglect to cite.
I think the events in London over the past year and a half should make clear which rabbonim are the ones who are prepared to stand up for the Torah.