Set tax_query conditionally with new WP_Query

You can’t set query parameters after the query happens, set them before you make the query-

$args = array(
    'post_type' => 'articles',
    'paged' => $paged,
);

if( some condition )
    $args['tax_query'] = array( your tax params );

$query = new WP_Query( $args );

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