There are literally thousands of threads on this forum.
Only a handful are ‘at the top’ and visible if you have your filter set to ‘latest’.
All the other threads are there for everyone to read - you just need to use the search function or set your filter to ‘nutrition’ or ‘recipes’ or ‘weight loss’ or whatever your topic of interest is and then have a browse through.
I have no idea why it was locked - it was locked long before I became a member on this forum. But I found it and read it easily, before anyone ‘linked’ to it.
However, I agree that linking to it again was useful for lots of people who hadn’t seen it.