The old board could disappear any day. Hard to believe they would throw away millions of posts made over 25 years, but that appears to be the plan. If done poorly, this could shatter trust. Why spend the time to craft a post that will be arbitrarily discarded. Some discussion would help. What is happening with the old board posts, and why?
You can still get to the old boards at this link and opening them works and doesn’t redirect. But yes, the redirect on the favorites page was to help people get to the new boards without the extra steps.