Try this:
1. Disable tags in Customize > Layout > Blog.
2. Add this function:
add_filter( 'generate_post_author_output', 'tu_add_tags_to_author' );
function tu_add_tags_to_author( $output ) {
$tags_list = get_the_tag_list( '', _x( ', ', 'Used between list items, there is a space after the comma.', 'generatepress' ) );
$tags = apply_filters( 'generate_tag_list_output', sprintf( '<span class="tags-links"><span class="screen-reader-text">%1$s </span>%2$s</span>',
_x( 'Tags', 'Used before tag names.', 'generatepress' ),
$tags_list
) );
return $output . $tags;
}