BuddyPress.org

No it’s not removal of lines as this is a function call.

Allways give the codex a quick check to see if there’s any help there, you want this page:
https://codex.buddypress.org/theme-development/modifying-the-buddypress-admin-bar/

And you need to be using remove_action() filter

There is a list of the add_action links on the page.

Add the remove_action to your functions.php in child theme.