Thank you for access data.
We did our best to make it compatible with BuddyPress Activity page, but unfortunately it could be solved. New wpDiscuz has more smart conditions to be loaded. For example, it checks if(comments_open($post)) using current page/post ID. But as far as we see for some reason BuddyPress return PostID = 0 for Activity page. Here is the screenshot on your website: https://screencast.com/t/WE9nxgnz
Also we found that BuddyPress prevent comments_template() from rendering in their functions, this is the most important part to allow wpDiscuz be loaded. For example in \buddypress\bp-core\bp-core-theme-compatibility.php file we see this comments:
* To prevent comments_template() from rendering, we set the 'is_page' and
* 'is_single' flags to false since that function looks at these conditionals
* before querying the database for comments and loading the comments template.
There may be a serious reasons why they don’t want this to happen, so I think the idea to load wpDiscuz on activity page can not be more important and it will not be a reason for BuddyPress do change their function logic.
We did everything from our side. I’m sorry but this problem can not be fixed in wpDiscuz code.