Hmm, that's interesting. It does look like you've found the right place to edit. We can see on this line, the brackets are wrapped around the shipping description https://github.com/magento/magento2/blob/9c14af7a97bcf338662de365d2613c7ca9dbf8c6/app/code/Magento/Quote/Model/ResourceModel/Quote/Address/Attribute/Frontend/Shipping.php#L27 If you edit that line and flush cache, does it definitely not change the result?
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