I just wanted to say that the "modern" and "Mobile First" display style of the forum is nice to look and "with the times", but the "load more" approach of displaying older posts is... not great. I would really like to explore older posts but like this its an absolute nightmare.
Unfortunately in the recent years this type of display style has become popular but it really is not ideal for forum type hubs. They are designed to prevent the user from being able to go back too far rather than giving the user easy "access". One mis-click can ruin things for you as well if you have ventured back a bit.
This forum is only 6 or 7 months old and its already seen a large number of posts and a lot of visits. Given the nature of this forum and its high profile its gonna grow exponentially in the future and I would suggest a traditional "pagination" style display will make this forum a much more useful and "referrable" resource.
So I wanted to suggest to please consider it.