The function that replaces is_taxonomy() is named taxonomy_exists(). Than there’s also is_tax() and is_tag() that check if the query is for a taxonomy archive page.
EDIT
$selected_sidebar_replacement == '0' || $selected_sidebar_replacement == '' won’t work. You’re not checking the type.
Better do it like this:
if ( ! $selected_sidebar_replacement OR emtpy( $selected_sidebar_replacement ) )
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