How is ‘products_article_list’ meta returned from in $article_list?
<?php $article_list = get_post_meta( get_the_ID(), products_article_list', true);?>
Is it a list of ids eg. ‘0601,0603’ or is it an array?
tax_query terms argument requires an array. See https://developer.wordpress.org/reference/classes/wp_query/#taxonomy-parameters
So if it’s stored as a list of ids all you need to do is explode the list and it should work.
...
'tax_query' => array(
array(
'taxonomy' => 'inputs',
'field' => 'slug',
'terms' => explode(',', $article_list),
),
),
...