BuddyPress.org

It sounds like Member Types could solve your problem: https://codex.buddypress.org/developer/member-types/

You can find their activity items via the db. Find their items by SELECT * FROMwp_bp_activityWHEREuser_id= 'USER_ID_YOU_WANT_TO_FIND'

Comments and posts should be delete-able via the WP Admin interface for those items.

If you have database access, take a look in wp_bp_activity. This query will find activity item comments:
SELECT * FROMwp_bp_activityWHEREtype= 'activity_comment'

It works like this:

add_filter('bp_get_activity_show_filters_options', 'my_buddypress_filter',10,2);
function mp_buddypress_filter($filters, $context) {
$filters['new_blog_post'] = 'Blog Posts';
$filters['new_blog_comment'] = 'Blog Comments';
$filters['bbp_topic_create'] = 'Forum Topics';
$filters['bbp_reply_create'] = 'Forum Replies';…[Read more]