“In other words, they aren’t thinking.”
Correct.
“That doesn’t make sense, because as the article notes, we pasken like the C”S, and is definitely not what Rav Belsky held.”
This article was written post-Rav Belsky, I believe. The issue came to light in time for him to weigh in on, but that statement at the end might have been made after he passed away. Didn’t they change their stance on Quinoa on Pesach right after Rav Belsky passed away?