Reply To: Add/Remove from TinyMCE

In the guide it does say this.

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Use this function below instead with new argument added to be able to add new media like the emoticon button.

function bbp_enable_visual_editor( $args = array() ) {
    $args['tinymce'] = true;
    $args['teeny'] = false;
    return $args;
}
add_filter( 'bbp_after_get_the_content_parse_args', 'bbp_enable_visual_editor' );

Please note that if you disable the teeny mode in the visual editor and allow other media buttons through the TinyMCE Advanced plugin, you will probably need to add on to this function and put it into your child theme functions.php file to allow your users to use some of the buttons like the table button.