Getting WordPress to store 0 values for custom post type meta

When using the == comparison, it compares the values at the same type. So 1 is equal to "1", and true. Likewise, 0 is equal to false.

Taking a deeper look into the return values of get_post_meta, we can see that using the $single=true 3rd argument returns a blank string ('') when no value is found, not false. So you should be checking to make sure THAT isn’t the case.

$post_meta_h = get_post_meta( $post->ID, 'stat_red_h', true );
$post_meta_a = get_post_meta( $post->ID, 'stat_red_a', true );
if( $post_meta_h !== '' || $post_meta_a !== '' ) {
    // do something
}

Let me know if this doesn’t work for you.

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