You need to modify the tax_query block of code like below-
$q->set( 'tax_query', array(array(
'taxonomy' => 'product_cat',
'field' => 'term_id', // Here it would be 'term_id' instead of only 'ID'.
'terms' => $allowedCats,
'operator' => 'IN' // May be it would be 'IN' in stead of 'NOT IN'. Cause you are passing allowed product categories.
)));
Hope that helps.
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