It’s funny that I overheard Reb Dovid talking about it and still don’t know about it. And it’s also funny that nobody managed get a straight answer from him.
Just to remind you where this thread was when you joined.
The OP want’s to use the eruv with the approval of the YV. We are still following Rav Moshe’s opinion as the RY of the just departed generation maintained they heard directly from him. Rav Dovid, Rav Shmuel Birnbaum, Rav Belsky, and others. What other Poskim feel comfortable with isn’t going to help change the status quo. The Brooklyn eruv has too much grief on it to become accepted by the YV.
You may have a bunch to say why it should not be that way. But the historical fact is that this is how it played out. Rav Moshe did not endorse any eruv in Brooklyn at any point. And as of today there is still no consensus to move away from that position.
So you do realize, that while you may permit him to carry in Brooklyn, your not helping the OP.
If we agree on that, then we can move on.