Just unsetting the cat variable probably isn’t enough. The pre_get_posts hook happens after the query variables have already been parsed. So there’s probably a tax_query with the taxonomy = category and the terms = your category.
You’re already dumping the $query in your code, presumably for debugging. So, look at what you’re actually dumping. Do you see the tax_query? Change your code to adjust that $query to have what you want it to have.
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