You’re missing the tax_query key, and it needs to be a nested array:
$args = array(
'post_type' => 'product',
'posts_per_page' => -1,
'tax_query' => array(
array(
'taxonomy' => 'product_cat',
'terms' => $cat_id,
'field' => 'term_id',
),
),
);
Check the documentation
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