Yes, virtually all the Poskim in Manchester who are involved in Eruvin have said that the Eruv is Kosher.
There was one person who misquoted an old Teshuva from Dayan YY Weiss but that was dealt with easily.
Ken Zayn, #2. The status is ‘not checked’ because it is for the following shabbos. On Friday it was green and as soon as Shabbos ended, it went back to “not checked’
One of the Rabbanim who was involved in the construction of this Eriv, was also involved in the Kashrus of the Yerushalyim Eruv.
He said that the Manchester Eruv is better than the one in Yrushalayim. So if you use that one then you can definitely use this one.
There are many aveiros that people do that are way worse than carrying in an Eruv.
Lets not get carried away here.
As far as what people should do, they should just ask their Rav. Why oh why do people feel the need to make a huge deal about something so tiny. (As someone said above, no one questions what other people do when it comes to Koreis shailos)